As we all know one way to prevent any type of cancer is to quit smoking.

Experts say it's not easy but benefits can be felt just 20 minutes after you decide to quit.

After only 12 hours the carbon monoxide levels in your blood decreases and after only two weeks your lung function improves to the point that you don't have that feeling of shortness of breath, giving you more exercise tolerance.

Doctors do warn though that those who give up the habit may experience some negative effects of nicotine withdrawal, like shaking or nervousness.

If you quit for good your risk of heart disease, stroke, and lung cancer is cut drastically.