Smoking how many cigarettes a day cause cancer?

Best NONE: Both direct and secondhand smoking of tobacco (and marijuana) are unsafe. 15% of smokers (>100 cigarettes in a lifetime) develop lung cancer. Even one per day is >300 cigarettes a year. 80% of all lung cancer is caused by smoking. Additionally, numerous other diseases and cancers are related to smoking. Please speak with family physician, respect yourself and be well.

100: 100 cigarretes on a lifetime increases risk for at least 10 years. However about 20% of smokers end up with lung cancer on their lifetime.However everybody does get emphysema to various degrees and accelerated arteriosclerosis triggering heart attacks and strokes at a younger age by persistent cigarrete smoking.Animal experiments dogs usually get cancer after 13, 000cigs.