What do carcinogens in tobacco smoke cause?

Harmful Chemicals in Tobacco Products Tobacco smoke. Cigarettes, cigars, and pipe tobacco are made from dried tobacco leaves. Other substances are added for flavor and to make smoking more pleasant. The smoke from these products is a complex mixture of chemicals produced by burning tobacco and its additives. read more

Pollution—outdoor air pollution or even secondhand tobacco smoke; Some carcinogens do not directly cause cancer but can lead to cancer. Some carcinogens cause cancer if you have long-term, high levels of exposure. read more