Smoking is very harmful. The nicotine in tobacco leaves, which can addict smokers, is very toxic and is one of the main protagonists of the diseases caused by smoking. Regarding the relationship between smoking and oral health, one usually thinks of bad breath and teeth blackened by smoke and depositing tartar. However, did you know that Smoking is a risk factor for oral carcinogenesis and is closely associated with oral white spots, among others. A survey showed that 33.5% of smokers occur oral mucosal white spots, non-smokers only 3.3% occur white spots. The difference between the two is almost 10 times. Smoking dry cigarettes, smoking time is long, the amount of smoking, the possibility of suffering from white spots is high. Nicotine in tobacco is the main culprit, and many carcinogenic substances released during high temperature combustion are the accomplices, which exist in the smoke, directly attacking the epithelial cells of oral mucosa, making them abnormally proliferate and forming white spots; they can also attack the genetic material of epithelial cells — DNA, making the reproduction of epithelial cells out of control and forming cancer. In addition, the high temperature produced during smoking can burn the contact part of oral mucosa.