Why Do Some Cigarettes Smell Worse Than Others?

SURGEON GENERAL’S WARNING: Quitting Smoking Now Greatly Reduces Serious Risks to Your Health.

Cigarette smoke smells the way it does because it is a mixture of more than 7,000 chemicals, and the smoke that lingers in a room, a car or a coat is not the same mixture as the smoke a smoker inhales. The differences people notice between cigarettes come from the tobacco blend, additives such as menthol, the paper and filter, how the cigarette burns, and above all the setting. This page explains the chemistry without describing any product, because what is in the smoke is the same story for every brand, and none of the chapters are flattering.

Last verified September 11, 2026. Sources at the end.

What is in the smoke

Burning tobacco produces a gas phase and a particle phase. The gas phase carries carbon monoxide, ammonia, hydrogen cyanide, acrolein, formaldehyde, acetaldehyde and several hundred other volatile compounds. The particle phase is what the industry calls tar: a condensate of thousands of compounds including nicotine, phenols and polycyclic aromatic hydrocarbons. Nicotine itself has a sharp, pyridine-like odor and is volatile enough to evaporate from surfaces at room temperature, which matters for what comes later. The CDC counts about 70 known carcinogens among the compounds in tobacco smoke.

Two kinds of smoke

Mainstream smoke is what the smoker draws through the cigarette and inhales; it passes through the tobacco column and the filter, and it is the smoke the old machine-yield ratings measured. Sidestream smoke is what rises from the lit end between puffs. It burns at a lower temperature with less oxygen, so it has a different balance of compounds: per gram, two to six times more condensate than mainstream smoke and much higher concentrations of some compounds (4-aminobiphenyl is more than ten times as concentrated). Sidestream smoke is about 85% of secondhand smoke, which is why the smell of a room where someone is smoking is mostly not the smell the smoker experiences. The smoker gets the filtered version. Everyone else gets the director’s cut.

Why one cigarette smells different from another

• The blend. American cigarettes are blends of flue-cured (Virginia), burley and oriental tobaccos in different proportions, each cured differently: flue-cured leaf is heat-dried, burley is air-dried, oriental is sun-dried. Different curing produces different sugar and nitrogen content, which produces different combustion products. A cigarette with more burley produces more ammonia-type compounds in smoke; one with more flue-cured leaf produces more of the compounds that come from sugars.
• Additives. US manufacturers add humectants, casings and flavorings to most cigarettes; the ingredient lists are filed with the FDA and, in Texas, with the state under Health and Safety Code 161.352. Menthol is the one additive that changes the smell of the smoke noticeably to a bystander, because it is itself volatile and its combustion products carry into sidestream smoke. Brands sold as additive-free (Natural American Spirit, Winston) burn only tobacco and paper, which changes the smoke’s composition, though not its health effects.
• Paper and filter. Cigarette paper contains burn-rate agents (citrate salts) that control how fast the cigarette smolders, and a faster-smoldering cigarette produces more sidestream smoke while it sits in an ashtray. Filters change what the smoker inhales but do nothing to sidestream smoke, so a filtered and an unfiltered cigarette left burning smell much the same to everyone else in the room. The filter was never for them.
• Cigars and cigarillos use air-cured and fermented tobacco with no paper, and the smoke is more alkaline, which is why cigar smoke reads as a different smell rather than a stronger version of cigarette smoke.

Why it lingers: third-hand smoke

The smell that stays after the smoke has cleared has a name in the research literature: third-hand smoke, the residue that settles onto surfaces, dust and fabric. Nicotine is the main component, and it does not just sit there. Sleiman and colleagues showed in 2010 that nicotine residue on indoor surfaces reacts with nitrous acid, a common indoor pollutant from gas appliances and vehicle exhaust, to form tobacco-specific nitrosamines, including NNK, that were not present in the original smoke. Studies of smokers’ former homes have found residue persisting through vacancy and standard cleaning, and studies of fabric have found the residue most persistent on wool and least on polyester, with a substantial amount surviving ordinary laundering. This is why a car, a couch or a jacket keeps its smell long after the last cigarette, why “non-smoker” is a line item in used-car listings, and why the smell of “old” smoke is chemically different from fresh smoke.

What helps and what does not

Ventilation while smoking limits how much residue settles but does not remove what has already bonded to surfaces. Odor sprays mask rather than remove; the couch is now smoke and vanilla. Washing hard surfaces with an acidic cleaner (vinegar solutions are the usual recommendation in the research on remediation) strips nicotine residue better than water alone; fabrics need repeated washing; carpets, upholstery and painted drywall in a long-term smoking space often cannot be fully remediated without replacement or repainting. None of this is health advice; it is what the surface chemistry says about getting the smell out.

Related: Unfiltered Cigarettes and Which Cigarettes Have the Most Menthol?

Sources

• CDC, Secondhand Smoke and Health Problems Caused by Secondhand Smoke
• US Surgeon General, The Health Consequences of Involuntary Exposure to Tobacco Smoke, 2006
• Sleiman et al., “Formation of carcinogens indoors by surface-mediated reactions of nicotine with nitrous acid,” Proceedings of the National Academy of Sciences, 2010
• FDA, menthol product standard rulemaking record, 2022
• Texas Health and Safety Code, section 161.352 (ingredient reporting)