How to Smoke a Bong: Step by Step, Plus the Honest Health Answer

A bong is a water pipe for smoking dry herb. You burn the material in a small bowl, the smoke travels down a tube into a chamber of water, bubbles up through it, and collects in a larger tube until you inhale it in one go. In Germany, taking a hit is "einen Kopf rauchen". The water takes a lot of heat out, so a big hit goes down feeling smaller than it is.

Cover the kick hole and suck on the mouthpiece. The bong is now under negative pressure, so air gets dragged through the burning bowl, down the downstem and up through the water. Some particles stay behind in the water and the smoke cools on the way. Then it piles up in the tube. Open the kick hole (or pull the bowl out, on a bong that has no hole) and outside air rushes in behind it, shoving the lot into your lungs. That second step is called the kick, or "kicken" if you're in a German smoking circle.

So a bong hit has two phases. First you fill the chamber slowly, then you clear it fast. Most beginner mistakes happen in the gap between the two.

You don't need the anatomy to learn how to smoke a bong. It just makes troubleshooting a lot less of a guessing game.

• Bowl (Kopf): the small cone where the herb goes. Some bowls hold a metal or glass screen (the bong screen, or Sieb in German) so ash doesn't get sucked down. A slide bowl, the Flutschkopf, is cut so it doesn't need a screen at all.
• Downstem (Chillum): short tube, bowl to underwater. Bubbles come out of its tip, which is often slotted.
• Water chamber: the base. Cooling happens here, and so does the gunk.
• Tube and mouthpiece: the smoke waits here. Wider or taller tube, bigger possible hit.
• Kick hole (carb): a hole above the waterline. Finger on while you pull, finger off to clear. No hole? Then the slide bowl is your release and you lift it out.
• Ground joints: where the glass pieces slot together. 14.5 mm and 18.8 mm are the two standard sizes, so check yours before you order a new screen or bowl.

Mostly convenience. Cooled smoke lets you take a big hit without it feeling like one. There's no rolling involved, a real selling point if your joints tend to run or fall apart. A bowl is over in a hit or two, where a joint takes ten minutes of passing around. Plenty of people smoke the herb pure in a bong, too, and skip the tobacco.

Downside? It's very easy to overdo.

Here's how to smoke a bong from dry glass to empty chamber. Do it in this order the first time. After that you won't need the list.

Quick version: water over the downstem tip. Small loose bowl. Finger on the kick hole, flame on one edge, slow pull. Finger off, clear it in one breath.

1. Add cold water: Pour it in through the mouthpiece until the downstem tip is just under. Exact level is below.
2. Grind your herb: Medium grind. Too fine and it gets sucked through the screen. A decent grinder makes a real difference here; hand-tearing works if you're stuck.
3. Pack the bowl loosely: Small and loose for your first one. Stuff it tight and it pulls hard and burns patchy, and a full bowl is a lot to take in one go.
4. Seal your mouth: Lips inside the rim of the mouthpiece. Over the outside leaks air.
5. Cover the kick hole: Finger on it, if your bong has one.
6. Light the edge of the bowl and pull gently: Flame on one side of the herb only. Draw slow enough that the water bubbles steadily and the tube goes milky.
7. Kick it: Flame away, finger off the kick hole (or lift the slide bowl), and pull the chamber clear in one go.
8. Exhale: No need to hold it. We'll get to the study on that further down; it doesn't help the breath-holders much.

At the end of the session, tip the water out (stale bong water smells like a bad decision).

Usually it's the water level, or a bad seal somewhere. This table covers the usual ones.

Quick leak test: thumb over the bowl, finger over the kick hole, pull on the mouthpiece. Air still moving means something isn't sealed.

How do you smoke a bong without coughing? Mostly by taking smaller hits. Fill the tube halfway and clear it, instead of pulling until it's solid white. Cold water helps. Ice too, if your bong has an ice catcher (the little glass notches in the tube that hold the cubes). Coughing after a hit (nobody's first one goes quietly) usually means it was too big or too hot.

Funny thing about smoother smoke, though. The smoother it feels, the bigger you tend to pull.

In Germany, a lot of people smoke their bong with a tobacco mix (Mische), mostly out of habit carried over from joints. Plenty of headshop guides treat it as the default. You don't need it. Herb burns fine on its own.

Tobacco brings nicotine, and nicotine comes with its own dependence on top of whatever cannabis does. Leave it out and every hit is pure cannabis. Keep that in mind for the next bit.

Bongs get passed around, and a few habits keep that civil. Shared mouthpiece, shared germs; wipe it between people, or bring your own mouthpiece cover if you don't know the group well. New round, new water. Don't just top up the old stuff. And nobody should be talked into a hit; passing it on is always fine.

Per hit, yes. Per gram, there's no good evidence that it does.

The "harder" part is real. A bong puts a whole bowl into your lungs in one breath, often with no tobacco to thin it out. A joint spreads the same amount over many puffs and you can put it down whenever you like. So dosing a bong by feel is tricky: by the time the first hit lands, you may already be packing the second. Tolerance helps regular smokers a bit. A full bowl in one breath still catches people out.

What about getting more out of your herb? Gieringer's MAPS/California NORML water pipe study (1996, revised 2000) found the unfiltered joint delivered close to 20% of the THC in the material. The bong came in slightly lower. The research cannabis was weak (about 2.3% THC), so don't lean on the exact numbers, but nobody has shown since that bongs are meaningfully more efficient. Earlier work cited in the same report puts THC losses in joints and water pipes at 60% to 80%, through sidestream smoke, burning, and residue.

Timing is the other half. Germany's federal prevention site cannabispraevention.de puts the effect of smoked cannabis as starting almost immediately, peaking at around 15 minutes, fading from 30 to 60 minutes, and usually over after about two to three hours. That 15-minute peak is why it pays to wait before the next one.

Holding a bong hit in for as long as possible is an old habit, and it mostly gets you more carbon monoxide. Zacny and Chait (1991) had regular smokers hold their breath for 0 or 20 seconds, with puff number and size fixed. After 20 seconds, carbon monoxide uptake was higher (an average boost of 6.9 ppm versus 4.4 ppm). Mood effects? Not consistently different. Their conclusion: prolonged breath-holding does not substantially increase the effects.

Ten people, same weak research cannabis. A pointer, then. It does match what most long-time smokers end up doing anyway. Breathe in, let it go after a second.

No. The one study we found that measured it actually found the opposite of what most people assume.

Cooler smoke feels gentler, so people assume it's cleaner. Gieringer's study checked that by measuring cannabinoids against tar in the smoke from different devices. The unfiltered joint came out at about 1 part cannabinoids to 13 parts tar. Every water pipe did worse. Even the bong, the best of them, produced about 30% more tar per unit of cannabinoids than the joint. His explanation is that water grabs THC more readily than it grabs tar, so you end up smoking more tar for the same effect.

The study has real limits, and the author flags some of them himself. It's old. The cannabis was weak. Drug-policy reform groups paid for it. And it never measured the gas phase of the smoke (things like hydrogen cyanide that water might catch). His own conclusion is that it's premature to call water pipes more harmful on that basis alone. Thin evidence, then. It's also the only direct comparison we found.

How you smoke counts for a lot too. Wu and colleagues looked at 15 men who smoked both tobacco and cannabis, in a 1988 NEJM study. Compared with a similar amount of tobacco, cannabis gave about five times the rise in blood carbon monoxide, about three times the inhaled tar, and a third more of that tar stayed in the lungs. Smoking style explained a big chunk of it: puffs about two-thirds larger, a third deeper, and breath held about four times longer. A bong makes that style easy. We go into smoke and lungs properly in Cannabis and Lung Health Explained.

Vaporisers work differently, heating the herb instead of burning it. In Gieringer's study they were the only devices that beat the joint on the overall cannabinoid-to-tar ratio. Recalculated for THC alone, though, one of the two fell below the joint and the other was only marginally better. Early, imperfect devices, and the author says as much. We compare the two methods in Joint vs Vaporizer: Which Is Better for You.

In the moment, yes, because there's no joint smouldering in an ashtray. The room tells a different story. Nguyen and Hammond measured fine particles (PM2.5) during real bong sessions in a home, in a 2022 study in JAMA Network Open. In six of the eight sessions, levels went 100 to 1,000 times above the background. The other two started from a higher baseline and still rose more than 20-fold.

Averages: about 410 µg/m³ in the first 10 minutes of smoking, 570 µg/m³ at 15 minutes, 1,000 µg/m³ at 30 minutes. One session peaked at 2,500 µg/m³. The researchers put that at about four times the levels from cigarette or tobacco hookah smoking. They kept monitoring one session for 12 hours afterwards, and particles were still more than ten times the background. Share a flat? Balcony or open window. Your sofa will thank you too.

The common methods, side by side, on what people actually ask about. Where there's no solid data, the table says so.

Cells without a source in brackets describe typical use.

Bong add-ons either break the smoke into smaller bubbles or cool it more. Each one costs you something.

• Percolator: an extra glass chamber (tree, dome, honeycomb, take your pick) that splits the smoke into lots of small bubbles. A percolator bong (Perkolator in most German shops) is smoother, pulls harder, and is a real chore to clean.
• Diffuser downstem: a downstem with extra slits or holes at the tip, so you get fine bubbles instead of one big glug. Cheap, and the easiest upgrade.
• Pre-cooler (Vorkühler): a mini water chamber between the bowl and the bong. More cooling, catches ash, adds drag, and gives you one more thing to wash.
• Ice catcher: the notches in the tube that hold ice cubes. Very cold smoke.

As far as we could find, no study shows any of these making the smoke cleaner. Smoother, sure.

Glass is standard. It tastes of nothing and cleans up well, and borosilicate glass copes with heat better than the cheap stuff. Acrylic is cheap and nearly unbreakable, but it scratches and won't survive harsh cleaners. Ceramic and metal bongs are mostly about looks. Ceramic also hides the dirt, so you won't see when it needs a wash.

A bucket bong (Eimer, in German slang) and a gravity bong (grav bong, for short) run on one trick. Sink a container in water. Lift it slowly, so the water drops and sucks smoke in through the bowl. Then push it back down, and the rising water forces the smoke into your lungs. Basically a piston. In the simple versions the smoke never bubbles through water, so there's hardly any cooling or filtering, and your dose is whatever fits in the container.

That's the draw. People describe them as about the strongest single hit going (the bravado usually lasts about one breath), and stopping halfway isn't really an option. German Wikipedia's entry on the Eimer says the pressure involved is no extra risk factor. Doctors writing case reports sound less relaxed. A 2023 case report from Australia's Northern Territory (Heraganahally and colleagues) describes three patients who needed hospital care right after bucket-bong use. One had acute pneumonitis (inflamed lung tissue). Two had a massive pneumothorax (a collapsed lung), and both of those already had bullous lung disease (damaged air pockets at the top of the lung). The authors say that added to their risk. Case reports can't tell you how common this is.

No build instructions from us. Home versions tend to involve plastic bottles and foil bowls, and heating either one is its own problem.

Skip the dishwasher. Glass doesn't love the temperature swings, and detergent residue ends up in your next hit.

Acrylic doesn't like alcohol or abrasives, so warm water and a mild cleaner for those. Swap the bong screen when it's clogged or letting ash through. Screens cost next to nothing; just get the right size, 14.5 or 18.8 mm.

Almost everyone gets one of these, usually off a gravity bong or the "one more" bowl. Heart going fast, and a strong feeling you've made a mistake.

Sit or lie down somewhere comfortable. Fresh air, a few sips of water. If you're with people, stay near the calmest one. Then remember the timeline: smoked cannabis peaks at around 15 minutes, starts to ease after 30 to 60 minutes and is usually over within two to three hours, so the worst bit tends to pass sooner than it feels like it will. Next time, plain harm reduction does the job. Smaller hits, more time between them. There's more in our piece on Greening Out From Weed.

If someone has chest pain, trouble breathing, or faints, that's no longer a "wait it out" situation. Call 112.

We don't sell bongs. Yet. No reason for us to talk one up over another. Bong culture runs on folklore: the water filters everything, a long hold gets you higher. Some of it is half right. Some of it is backwards.

So we've given you the numbers we could check, and said where they're thin. A bong gets a big hit into you fast and comfortably. Beyond that, the studies we found don't give it much credit.