What are the common things we do that can cause cancer?

From Cancer - Wikipedia, the free encyclopedia (http://en.wikipedia.org/wiki/Cancer) :


Lifestyle choices cause cancer: tobacco, diet, exercise, alcohol, tanning choices, and certain sexually transmitted diseases are the major risks. "Most cancers are related to known lifestyle factors."[10]

There is also a growing body of research that correlates cancer incidence with the lower levels of melatonin produced in the body when people spend more time in bright-light conditions[citation needed], as happens typically in the well-lit nighttime environments of the more developed countries. This effect is compounded in people who sleep fewer hours and in people who work at night, two groups that are known[citation needed] to have higher cancer rates.

See the article for more info.