Even if you don't inhale, smoking the occasional cigar raises your odds for heart disease and a wide variety of cancers. While no one's figured out the precise risk, consider this: because cigars are bigger than cigarettes, take longer to smoke, use tobacco that's aged and fermented, and are rolled in slower-burning wrappers a single large cigar emits up to 20 times more ammonia, five to 10 times more cadmium (a carcinogenic metal) and up to 80 to 90 times more highly carcinogenic nitrosamines.
A definitive U.S. National Cancer Institute report on cigar smoking points out, "All smokers, whether or not they inhale, directly expose the lips, mouth, throat, larynx and tongue to smoke." Additionally, "smoke constituents in the saliva are swallowed into the esophagus."
If you smoke one or more cigars every day, you've raised your odds for heart disease, serious lung problems, and a wide variety of cancers on virtually every part of your body that is exposed to tobacco smoke, from your lips, tongue, mouth and throat to your esophagus, larynx and lungs.
The more you smoke, the higher the risk: while one or two cigars a day doubles your risk for cancers of the mouth; puffing three or four raises your risk more than eight times above normal; smoking five or more cigars a day boosts it to 16 times higher than that of nonsmokers.