Tobacco smoke contains many chemicals that are harmful to both smokers and nonsmokers. Breathing even a little tobacco smoke can be harmful. Of the more than 7,000 chemicals in tobacco smoke, at least 250 are known to be harmful, of which 69 can cause cancer or increase the risk of developing cancer.
Tobacco use is a leading cause of cancer and of death from cancer. People who use tobacco products or who are regularly around environmental tobacco smoke (also called secondhand smoke) have an increased risk of cancer.
People who smoke any kind of cigarette are at much greater risk of lung cancer than people who do not smoke. Smoking harms nearly every organ of the body and diminishes a person’s overall health.
In particular, research links smoking with increased incidence of cancers of the lung, esophagus, larynx, mouth, throat, kidney, bladder, pancreas, stomach and cervix.
There is no safe level of smoking. Smoking even just one cigarette per day over a lifetime can cause smoking-related cancers (lung, bladder, and pancreas).
Regardless of their age, smokers can substantially reduce their risk of disease, including cancer, by quitting.