How smoking increases cancer risk
Cigarette smoke contains more than 7,000 chemicals including 69 that are carcinogens (known to cause cancer). When you inhale, these chemicals enter your lungs and spread through your body via blood and lymph systems. This can interrupt normal cell growth, causing cells to multiply too fast or develop abnormally, which can (and often does) result in cancer cells.
Exposure to second-hand smoke is a cause of lung cancer in non-smokers. When smokers expose non-smokers to second-hand smoke, they inhale many of the same cancer-causing chemicals that smokers inhale.
To find out your cancer risk, take the Cancer Risk Quiz.
Cancer Council recommendations
Quitting smoking or never starting is the best way to reduce your cancer risk. The body starts to repair itself within 6 hours of the last cigarette, and after 10 years the risk of dying from lung cancer is about half that of a person who is still smoking. Anyone can benefit from quitting smoking, including those who may have already developed smoking related health problems. By quitting, you also reduce the risk of those around you who may be exposed to your second-hand smoke.
Find out more about smoking and cancer prevention.