Is smoking the main reason for cancer or not

Is smoking the main reason for cancer or not
Macnair, P. “Smoking-health risk-Netdoctor.” www.netdoctor.co.uk/healthadvise/facts/smokehealth.htm
* Whitehead, C. “Two main causes of cancer.” eHow http://www.ehow.com/about_5300805_two main-causes-cancer.htm
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