Cancer- it´s causes
April 17th, 2008
A ‘carcinogen’ is something that can help to cause cancer. Tobacco smoke is a powerful carcinogen. But not everyone who smokes gets lung cancer. So there must be other factors at work.

April 17th, 2008
A ‘carcinogen’ is something that can help to cause cancer. Tobacco smoke is a powerful carcinogen. But not everyone who smokes gets lung cancer. So there must be other factors at work.
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