About 72 million Indians smoke bidi — making it the most widely used form of smoked tobacco in the country by volume. It outsells cigarettes in rural areas and among lower-income populations, and it is frequently perceived as a traditional, herbal, or simply less-harmful product than the manufactured cigarette. This perception is widespread, deeply held, and measurably wrong. The toxicology of bidi smoke has been studied directly and compared to cigarette smoke in multiple laboratory analyses. The results consistently show that bidi delivers more nicotine, more carbon monoxide, more tar, more hydrogen cyanide, more phenol, and more ammonia per stick than a conventional filtered cigarette — not less.
For a person with diabetes, or at risk of it, this matters enormously. The specific compounds that drive the diabetogenic effects of tobacco — primarily nicotine causing insulin resistance, and carbon monoxide disrupting glucose metabolism — are present in bidi smoke at higher concentrations than in cigarette smoke. The biological mechanisms by which smoking causes, worsens, and accelerates complications of diabetes operate just as powerfully in bidi smokers as in cigarette smokers, and by several measurable metrics more so.
Does bidi cause diabetes? The same mechanisms by which cigarette smoking causes Type 2 diabetes operate in bidi smoke — because bidi contains the same causally relevant compounds. Nicotine from bidi smoke activates the mTOR→IRS-1→GLUT4 pathway that blocks insulin signalling in muscle cells, directly causing insulin resistance. Carbon monoxide disrupts tissue oxygenation and glucose metabolism. WHO and ADA classify smoking as a causal risk factor for T2DM. Bidi delivers these compounds at higher concentrations than cigarettes.
Is bidi safer than cigarettes for diabetes? No. Per stick, bidi delivers more of every major diabetogenic and toxic compound. It also lacks a filter. The only sense in which bidi could be considered "less harmful" is if a person smokes significantly fewer bidis than they would cigarettes — but because bidi requires more puffs per stick (28 vs 9 for a cigarette) and delivers more nicotine per puff, dependence levels can be comparably high.
What People Believe About Bidi — and What the Evidence Says
Bidi vs Cigarette — The Toxic Compound Comparison
The following comparison draws on PMC laboratory analysis of bidi and cigarette smoke constituents (PMC6661734; PMC12913643), the Mumbai cohort study (PMC3756904), and CDC bidi toxicology fact sheet data. All measurements are per stick under standardised conditions.
| Compound | Cigarette | Bidi | Relative Level in Bidi |
|---|---|---|---|
| Carbon Monoxide (CO) | 3.5 vol% | 7.7 vol% | 2.2× higher |
| Nicotine (per stick) | 0.77 mg (median) | 1.70 mg (median) | 2.2× higher |
| Nicotine concentration in tobacco | 16.3 mg/g | 21.2 mg/g | 30% higher |
| Tar | Lower | Higher (no filter) | Significantly higher |
| Hydrogen Cyanide | 445 µg | 903 µg | 2× higher |
| Phenol | 150 µg | 250 µg | 67% higher |
| Ammonia | 180 µg | 284 µg | 58% higher |
| Puffs required per stick | ~9 puffs | ~28 puffs | 3× more puffing |
| Filter present | Yes (most) | No | No filtration at all |
The defining feature of bidi is its wrapper: tendu (Diospyros melanoxylon) leaf, a non-porous natural material. Unlike cigarette paper, which is designed to allow controlled air flow during combustion, tendu leaf does not allow air to mix with the burning tobacco. This means the tobacco combusts in a more oxygen-deprived environment — producing more carbon monoxide (incomplete combustion produces CO; complete combustion produces CO₂) and more tar. The smoker must also puff more frequently and forcefully to keep the bidi alight — drawing more smoke more deeply into the lungs with each puff. The result is that despite containing less tobacco by weight, a bidi exposes the smoker to more of every measurable harmful compound than a cigarette of comparable weight.
How Bidi Causes and Worsens Diabetes — The Mechanism
Bidi smoke drives diabetes risk and worsening through the same molecular mechanisms as cigarette smoke — because it contains the same causally relevant compounds. The difference is one of dose, not mechanism: because bidi delivers more nicotine and more carbon monoxide per stick, the diabetogenic signal is stronger per smoking event.
This is the specific chain of molecular events — confirmed in controlled research (Bergman et al., Diabetes 2012) — by which nicotine from bidi smoke causes insulin resistance:
Because bidi delivers more nicotine per stick than a cigarette — and because bidi smokers puff more deeply and frequently — the mTOR→IRS-1 brake is activated more strongly per smoking event in bidi smokers than in cigarette smokers smoking equivalent numbers.
Carbon monoxide adds a second mechanism: CO from bidi smoke (at 2.2× the concentration of cigarette CO) reduces tissue oxygenation and disrupts glucose metabolism in oxygen-deprived tissues, adding to the blood glucose elevation caused by the nicotine-driven insulin resistance above. Both mechanisms operate simultaneously with every bidi smoked.
What the PURE Study Found — Bidi and Cardiovascular Risk in South Asia
The Prospective Urban Rural Epidemiology (PURE) study — one of the largest long-term community studies in South Asia — followed men in India, Pakistan, and Bangladesh for a mean of 5.6 years, comparing cardiovascular events, respiratory events, and all-cause mortality across smoking categories.
The findings directly relevant to bidi smokers with diabetes: hazard ratios for all-cause mortality and cardiovascular events increased progressively across the categories of non-smoker → light smoker → heavy cigarette smoker → heavy bidi smoker. Heavy bidi smokers had the highest event rates — not heavy cigarette smokers. The study authors concluded that bidi smoking carries at least the same cardiovascular risk as cigarette smoking, and the data suggested a higher risk at comparable pack-year levels.
A diabetic who smokes bidi is combining two of the strongest independent cardiovascular risk factors known to medicine. Diabetes alone multiplies cardiovascular risk 2–4 fold. Smoking alone multiplies it 2–3 fold. Together, the Finnish study found that diabetic male smokers had a hazard ratio of 6.15 for coronary heart disease mortality compared to non-diabetic non-smokers — a risk elevation that is not simply additive. For diabetic bidi smokers, where the tobacco-driven risk may be even higher than for cigarette smokers, this combination is the most dangerous it can be.
The PURE data also showed that bidi smokers had significantly worse baseline spirometry (lung function) than cigarette smokers — meaning the respiratory complications of diabetes (which include reduced exercise tolerance, increased infection risk, and autonomic dysfunction) are compounded more severely in bidi smokers.
"Despite having less tobacco compared to conventional cigarettes, bidi smokers are potentially exposed to significantly higher concentrations of nicotine. The non-porous nature and higher moisture content of tendu leaf leads to higher levels of carbon monoxide and tar in bidi smoke compared to regular cigarette smoke."
Analysis of Chemical Constituents in Mainstream Bidi Smoke — PMC6661734 (NIH)If You Have Diabetes and Smoke Bidi — What to Do
Tell your doctor explicitly
Many Indian diabetology consultations ask about "smoking" and record either yes or no — without capturing the type of tobacco. A patient who says "I don't smoke cigarettes" while smoking 15 bidis per day is clinically miscategorised. Tell your doctor specifically: "I smoke bidi — [X] per day." This matters for risk assessment, for understanding why blood glucose control may be proving difficult (the mTOR insulin resistance mechanism), and for cessation support.
Understand why your HbA1c may be harder to control
If your blood glucose is not responding as expected to medication, bidi's nicotine-driven insulin resistance is a plausible contributing factor. The mTOR→IRS-1→GLUT4 mechanism means that every bidi you smoke is partially blocking the insulin signal that your medication depends on. This is not a vague general risk — it is a specific molecular mechanism that operates in your muscle cells with every bidi smoked.
Cessation is the goal — and support is available
Nicotine replacement therapy (patches, gum, lozenges) and varenicline (Champix) are effective for bidi cessation — the nicotine dependence mechanism is the same as for cigarettes. The National Tobacco Quitline (1800-11-2356, free, Monday–Saturday, Hindi and English) provides structured cessation support. Ask your diabetologist to prescribe cessation support at your next appointment — it is a clinical intervention for glucose control, not just a lifestyle recommendation.
Frequently Asked Questions
The Bottom Line
Bidi is not a safer alternative to cigarettes. By every measurable toxicological metric — carbon monoxide, nicotine, tar, hydrogen cyanide, phenol, ammonia — bidi delivers more harmful compounds per stick than a conventional filtered cigarette. The tendu leaf wrapper is the reason: its non-porous nature forces more incomplete combustion (producing more CO), forces the smoker to puff more deeply and frequently, and provides no filtration at all.
For diabetes specifically: the nicotine in bidi smoke activates the same mTOR→IRS-1→GLUT4 pathway that blocks insulin signalling in cigarette smokers — and at higher nicotine concentrations per stick, the insulin resistance effect is stronger per bidi than per cigarette. The PURE study found that heavy bidi smokers in South Asia had higher cardiovascular event rates than heavy cigarette smokers. For a diabetic bidi smoker, the combination of tobacco-driven insulin resistance, CO-mediated metabolic disruption, and diabetes-driven cardiovascular risk creates a compounded risk profile that is among the most dangerous in common clinical practice.
Cessation is the intervention. NRT and varenicline work for bidi smokers. The National Tobacco Quitline is free: 1800-11-2356. Tell your doctor you smoke bidi — and how many. That conversation, combined with structured cessation support, is the most important diabetes management step available to a bidi smoker.