Yes, smoking cigars is bad for your health. While many people assume cigars are a safer alternative to cigarettes, the data tells a different story. A single full-size cigar can contain as much tobacco as an entire pack of cigarettes, and cigar smoke carries higher concentrations of toxic and cancer-causing compounds than cigarette smoke.
Cancer Risk Rises Sharply With Frequency
The biggest health threat from cigars is cancer, particularly of the mouth, throat, esophagus, and lungs. The National Cancer Institute’s Cancer Prevention Study tracked cigar smokers over 12 years and found that risk scales dramatically with how many cigars you smoke per day.
For mouth and throat cancer, smoking just one or two cigars daily roughly doubles the risk compared to a nonsmoker. At three to four cigars a day, the risk jumps to about 8.5 times higher. At five or more, it reaches nearly 16 times the risk of someone who has never smoked. Esophageal cancer follows a similar pattern: about twice the risk at one to two cigars daily, climbing to five times the risk at five or more. Lung cancer risk stays close to baseline at one to two cigars a day (assuming no inhalation), but triples for people smoking five or more daily.
These numbers explain why cigar smoking is sometimes framed as “less dangerous” than cigarettes. If you smoke one or two cigars a week and never inhale, your risk profile looks very different from someone smoking five cigars every day. But “lower risk than heavy use” is not the same as safe.
Inhalation Changes Everything
How you smoke a cigar matters almost as much as how often. Most cigar smokers don’t inhale deeply the way cigarette smokers do, and that distinction has real consequences for lung exposure. But the mouth, throat, and esophagus absorb carcinogens regardless of whether you pull smoke into your lungs.
The Cancer Prevention Study data makes this point clearly. Cigar smokers who reported no inhalation still had a mouth and throat cancer risk nearly seven times higher than nonsmokers. Those who inhaled moderately to deeply had a risk almost 28 times higher. For esophageal cancer, moderate-to-deep inhalers faced nearly 15 times the risk. And lung cancer risk jumped from about twice the baseline with no inhalation to nearly five times the baseline with deep inhalation.
Former cigarette smokers who switch to cigars tend to inhale more than lifelong cigar smokers, which pushes their risk profile closer to that of continued cigarette use. If you learned to smoke with cigarettes, your body’s habit of pulling smoke deep into the lungs doesn’t disappear just because you changed the product.
What Makes Cigar Smoke Particularly Toxic
Cigar tobacco goes through a fermentation process that cigarette tobacco does not. This fermentation produces higher levels of certain cancer-causing compounds called tobacco-specific nitrosamines. Research published in Chemical Research in Toxicology found that even small cigars (sometimes marketed as “little cigars”) contain roughly 250 to 290 percent more of these compounds in their tobacco compared to commercial cigarettes. When smoked, the levels in the inhaled smoke were 300 to 400 percent higher than cigarettes, depending on how intensely the cigar was puffed.
Cigar smoke also produces significantly more carbon monoxide than cigarette smoke, simply because there’s more tobacco burning for a longer period. A single cigar can emit over 1,000 milligrams of carbon monoxide during a smoking session. That carbon monoxide enters your bloodstream and reduces the amount of oxygen your blood can carry, which strains the heart and blood vessels over time.
Heart and Lung Disease
Cancer gets the most attention, but cigars also raise the risk of cardiovascular disease and chronic lung problems. Nicotine from cigar smoke gets absorbed through the lining of the mouth even without inhalation, which raises blood pressure, increases heart rate, and narrows blood vessels. Over time, this contributes to coronary heart disease. Cigar smokers who do inhale face additional risk because carbon monoxide and fine particles reach the lungs directly, accelerating damage to the airways and contributing to chronic obstructive pulmonary disease.
The “Occasional Cigar” Question
Most people searching this question aren’t planning to smoke five cigars a day. They want to know whether the occasional cigar at a celebration or on a weekend is a meaningful health risk. The honest answer is that the data on very occasional use (a few cigars per month or less) shows a much smaller increase in risk than daily use. The one-to-two-cigars-per-day group in the Cancer Prevention Study showed only modestly elevated risks for lung and esophageal cancer, and those people were smoking every single day.
That said, “small risk” is not “no risk.” Every exposure to cigar smoke delivers carcinogens to the tissues of your mouth and throat. Nicotine absorption happens with every cigar, and nicotine is addictive. What starts as an occasional habit can become a regular one, and regular cigar smoking carries serious, well-documented health consequences. There is no threshold of cigar use that has been shown to be completely free of harm.
Secondhand Cigar Smoke Is Worse Indoors
If you smoke cigars indoors or around others, the secondhand smoke is a separate concern. A single cigar burning in a standard office-sized room produces enough fine particulate matter and carbon monoxide to significantly degrade air quality. Measurements from the National Cancer Institute found that one cigar emitted about 77 milligrams of respirable particles on average, with carbon monoxide emissions exceeding 1,000 milligrams per cigar. Larger premium cigars smoked over 75 to 90 minutes continuously release fine particles at roughly 1 milligram per minute for the entire session.
These particles are small enough to penetrate deep into the lungs of anyone in the room. In poorly ventilated spaces, a single cigar can push carbon monoxide levels to concentrations that would concern indoor air quality experts. This is one reason many jurisdictions that ban indoor cigarette smoking also include cigars in those regulations.