The single most important thing to know about shisha and your mouth is that the water does not remove the harmful constituents of the smoke. NSW Health states this plainly in its own waterpipe factsheet. The water cools the smoke and makes it feel smooth, which is a very different thing from filtering it. Everything else about a waterpipe, the long sessions, the burning charcoal, the shared hose, follows from that starting point. This article sticks to what a waterpipe does that a cigarette does not, because that is where the useful information sits.
Key takeaways
- NSW Health states that the water does not remove any of the toxins, and that fruit flavouring masks the taste of toxic substances rather than making the product safer.
- A meta analysis by Primack and Carroll found a single waterpipe session delivers around 74 litres of smoke compared with about 0.6 litres for one cigarette.
- An average session delivers roughly 11 times the carbon monoxide, 25 times the tar and two to three times the nicotine of one cigarette.
- Herbal and tobacco free shisha is not a safe alternative, because the burning charcoal alone produces carbon monoxide and carcinogens.
- Waterpipe tobacco smoking has been associated with oral cancer at an odds ratio of 4.17 in a systematic review and meta analysis, from observational evidence.
- NSW smoke-free laws apply to shisha specifically, covering all enclosed public places and a list of outdoor areas including within 4 metres of many entrances.
What actually makes a waterpipe different
The difference is exposure, not exotic chemistry. Waterpipe smoke contains much the same families of harmful substances as cigarette smoke, including nicotine, carbon monoxide, tar, carcinogens and heavy metals. Around 300 chemicals have been identified in waterpipe tobacco and its smoke, with 27 known or suspected carcinogens among them. What sets a session apart is how much smoke passes through the mouth, for how long, and what is burning above it.
Session length and smoke volume
A cigarette takes about five minutes. A waterpipe session runs from around 15 minutes to several hours, with 30 to 60 minutes typical according to the Quit Victoria fact sheet. Each puff is roughly ten times the volume of a cigarette puff. Primack and Carroll, publishing in Public Health Reports, put a single session at approximately 74.1 litres of smoke against 0.6 litres for one cigarette, which is where the figure of more than 100 times the volume comes from.
NSW Health puts this to the public as 45 minutes of shisha equalling 100 cigarettes. It is worth being precise about what that means, because retailers attack the line and health pages repeat it without explanation. It is a smoke volume comparison, not a toxin for toxin equivalence. A session delivers far more carbon monoxide, tar and lead than one cigarette, and for some individual carcinogens it delivers less. The figure is accurate about volume, and volume is what matters for the tissues lining your mouth.
The charcoal is its own problem
The charcoal is a source of harm independent of what it is heating. Burning charcoal generates high levels of carbon monoxide, ultrafine particles and carcinogenic polycyclic aromatic hydrocarbons. This applies whether or not the bowl contains tobacco, which is why NSW Health says that herbal and tobacco free shisha can be just as harmful. Research has found that people using tobacco free waterpipe products inhale at least as much carbon monoxide as those using tobacco.
Carbon monoxide poisoning from waterpipe use is documented in Australia. The Medical Journal of Australia reported a 20 year old woman hospitalised after severe light headedness and nausea following a one hour session. In one cohort of 61 poisoned patients the initial mean carboxyhaemoglobin was close to 27%, with loss of consciousness in 43.6%, and roughly a fifth of cases occurred after less than an hour of use.
Why the water does not filter what people think it filters
The bowl of water is a cooling device. Smoke bubbling through water loses heat, which is what makes a long session comfortable in a way that chain smoking never is. Carbon monoxide is a gas that passes straight through, and fine tar particles carry through with it. NSW Health is unambiguous that the water removes none of the toxins. This is the single most common misconception about waterpipes, and the smoothness of the smoke is genuinely persuasive evidence to the person inhaling it.
Accessories marketed as harm reducing do not change this. World Health Organization advisory work notes that no device such as an activated charcoal mouthpiece, bubble diffuser or ice hose has been shown to reduce toxin exposure or disease risk. Fruit flavouring changes the taste, and NSW Health notes it masks the taste of toxic substances rather than removing them.
One session compared with one cigarette
The table sets out the main comparisons and what each one means inside the mouth.
| Measure | One cigarette | One waterpipe session | What it means in the mouth |
|---|---|---|---|
| Smoke volume inhaled | About 0.6 litres | About 74 litres | Far more contact time between smoke and the tissues lining the mouth |
| Carbon monoxide | Baseline | Around 11 times | Impairs oxygen delivery, which matters for healing after surgery |
| Tar | Baseline | Around 25 times | Tar is the main driver of surface staining on enamel |
| Nicotine | Baseline | Around two to three times | Narrows small blood vessels and can mask gum bleeding |
| Duration | About five minutes | Typically 30 to 60 minutes | Prolonged drying and heat exposure across the whole mouth |
| Secondhand carbon monoxide released | Baseline | One hour is comparable to about 20 cigarettes | Affects everyone at the table, including people not smoking |
| Toxins removed by the water | Not applicable | None | The most persistent myth about waterpipes |
| Herbal or tobacco free version | Not applicable | At least as much carbon monoxide, same charcoal carcinogens | No safer for gums, healing or staining |
What it does inside your mouth
The mouth takes the first and heaviest dose, which is why a dental practice has something specific to add here.
Staining, taste and dry mouth
NSW Health lists tooth staining and impaired taste and smell among the effects of waterpipe use. Tar is the main culprit, and at roughly 25 times the tar of a cigarette per session, discolouration builds quickly. Long sessions also dry the mouth, and saliva is the mouth's own buffering and cleaning system. A drier mouth means more plaque retention and more staining again, and the effect lasts well beyond the session itself.
Gums and the bone around your teeth
Waterpipe smoking is associated with loss of the alveolar bone that supports the teeth and with deep periodontal pockets, along with greater inflammation, more Candida and premalignant lesions. The evidence is not perfectly consistent. At least one meta analysis reported no significant association with periodontal disease while other reviews found clear associations with bone loss and pocketing, so the association is supported but not uniform.
Nicotine complicates the picture in a particular way. It constricts small blood vessels, so gums that are inflamed may bleed less than they otherwise would. Bleeding gums are the usual early warning sign that something is wrong. Losing that signal is not the same as being healthy.
Healing after extractions and implants
Smoking roughly doubles the odds of early dental implant failure. A 2024 analysis in the Journal of Dentistry reported an implant level odds ratio of 2.59 and a patient level odds ratio of 2.00, with risk markedly higher in the upper jaw. Waterpipe smoking is also associated with dry socket after extractions. One caveat applies: no study has isolated waterpipe smoking for these outcomes, so the figures come from smoking generally. That is still enough to make timing worth discussing before oral surgery, and our piece on dental implants and smoking risks covers the planning.
Oral cancer risk, stated carefully
Waterpipe tobacco smoking is associated with substantially increased odds of oral cancer. A systematic review and meta analysis reported an odds ratio of 4.17 for oral cancer and a summary relative risk of 2.97 for head and neck cancer. Waterpipe smoking is also established as increasing the risk of lung, stomach and oesophageal cancer. These are observational findings, so association is the correct word rather than causation.
For Australian context, Cancer Australia recorded 5,097 new head and neck cancers including lip in 2021, with an estimated 5,577 in 2025, and more than 900 new intraoral carcinoma cases are registered here each year. A routine dental examination includes a look at the soft tissues, and our guide to oral cancer screening explains what that check involves and what is being looked for.
The shared mouthpiece
Sharing a hose is a direct oral transmission route. NSW Health states that shared mouthpieces and hoses may pass on diseases including herpes, hepatitis and lung infections, and tuberculosis outbreaks have been reported among people sharing waterpipes. Quit Victoria notes more research is needed before confirming increased infection risk, so no transmission rate should be quoted. Using your own disposable mouthpiece is a small, practical step.
The legal position in Australia and NSW
Waterpipe tobacco is legal for adults in Australia but heavily regulated. Most tobacco products, including molasses tobacco, are prohibited imports requiring an Australian Border Force permit along with duty and GST. Enforcement in NSW is active, with laws allowing NSW Health, supported by NSW Police, to issue short term closure orders of up to 90 days on premises selling illicit tobacco.
NSW smoke-free laws apply to shisha explicitly, covering any ignited tobacco or non-tobacco product including waterpipes. That means all enclosed public places such as workplaces, cafes, restaurants, shopping centres, trains and buses, plus specified outdoor public places including outdoor seated dining areas, sports grounds, swimming pools and public transport stops. It also includes within 4 metres of entrances to public buildings and outdoor seated dining areas, and within 10 metres of children's outdoor play equipment and food fair stalls.
If you want to cut down
Australian quit support covers waterpipes and is free to use. Quitline is 13 7848, with lines in Arabic on 1300 784 803, Chinese on 1300 784 836 and Vietnamese on 1300 784 865. The Tobacco Information Line is 1800 357 412 and the Translating and Interpreting Service is 13 1450. NSW Health runs iCanQuit at icanquit.com.au, and ShishaNoThanks at shishanothanks.org.au is a NSW community campaign built around waterpipe use. Dependence is real here. Daily users take in nicotine roughly equivalent to ten cigarettes a day, and in adolescents dependence symptoms have emerged at around six days of use per month.
How this differs from our other posts
Our article on smoking and oral health covers cigarettes and the general mechanisms of harm. Vaping and oral health deals with aerosol rather than combustion, so the dry mouth and gum findings differ. Nicotine pouches and your gums covers a smokeless product where the harm is concentrated at one spot in the mouth. This piece is about the waterpipe specifically, where session length, charcoal and sharing create a pattern the others do not.
Common questions
Does the water filter out the harmful stuff?
No. NSW Health is explicit that the water removes none of the toxins. It cools the smoke, which makes long sessions comfortable, while carbon monoxide passes straight through as a gas and fine tar particles carry through with it. No mouthpiece, diffuser or ice hose has been shown to change this.
Is herbal or tobacco free shisha safe?
No. The burning charcoal alone produces carbon monoxide and carcinogens regardless of what is in the bowl, and people using tobacco free products have been found to inhale at least as much carbon monoxide. NSW Health states that these products can be just as harmful. The nicotine may be absent, but the smoke is not.
Does shisha stain your teeth?
Yes. NSW Health lists tooth staining among the effects, along with affected taste and smell. Tar is the main driver, and a session delivers roughly 25 times the tar of a single cigarette. A professional clean removes surface stain, though it will rebuild if sessions continue.
Can I smoke shisha after an extraction or an implant?
It is best avoided around any oral surgery. Smoking roughly doubles the odds of early dental implant failure and is associated with dry socket after extractions, and carbon monoxide reduces the oxygen supply that healing tissue needs. Ask your dentist about timing before the procedure rather than after, because the answer depends on what is being done.
Is shisha legal in Australia?
Yes for adults, with significant restrictions. Molasses tobacco is a prohibited import requiring an Australian Border Force permit plus duty and GST, and NSW smoke-free laws apply to shisha in all enclosed public places and a list of outdoor areas.
If you smoke shisha regularly, the useful thing a dentist can do is check the gums, the bone level and the soft tissues, and give you a clear picture rather than a lecture. The team at Lumi Dental in Melrose Park can do that at a routine check up, with any recommendations in writing before anything goes ahead. Current new patient offers are on current deals, you can book online, and our general dentistry page explains what an examination covers.
This article is general information only and is not personal advice. Risk varies with how often and how long a person smokes, and only an in person examination can tell you what is happening in your mouth. Please see a dental or medical professional about your own situation.
