Smoking increases the risk of lung cancer
Scientific research has proven conclusively that smoking cigarettes is the most significant risk factor for developing lung cancer. Smoking is the cause of the disease in 85 to 90% of lung cancer cases. On average 15 to 20% of all smokers develop lung cancer.
Smoking cigars and pipes also increases the risk of lung cancer, as does passive smoking. Tobacco smoke contains countless toxic substances, with carcinogenic tar being the worst offender. Nicotine is highly addictive, but is not carcinogenic in itself.