Lung Cancer Prevention
Second-hand tobacco smoke also causes lung cancer. This is smoke that comes from a burning cigarette or other tobacco product, or smoke that is exhaled by smokers. People who inhale second-hand smoke are exposed to the same cancer-causing agents as smokers, although in weaker amounts. Inhaling second-hand smoke is called involuntary or passive smoking.
There are other causes of lung cancer in the environment, but their effect on lung cancer rates is small compared to the effect of cigarette smoking. Cancer-causing agents that may be found indoors, especially in the workplace, include:
These substances can cause lung cancer in people who have never smoked, and combine with cigarette smoke to further increase lung cancer risk in smokers. Many countries are working to control these cancer-causing agents in the workplace.
Air pollution may also increase the risk of lung cancer. Studies show that lung cancer rates are higher in cities with higher levels of air pollution.
Lung cancer research studies show that beta carotene use in relatively high-intensity smokers increases the risk of lung cancer.