简单讲，就是抽雪茄与抽卷烟有同等致癌风险； 而只抽烟斗不抽卷烟的，风险似乎较抽卷烟低一些。
Tobacco use
Smoking is by far the biggest risk factor, causing 80-85% of lung cancer in the U.S. The degree of risk increases with the number of years the person smoked and the number of packs a day the person smoked. The 2010 Surgeon General’s report How Tobacco Smoke Causes Disease: The Biology and Behavioral Basis for Smoking-Attributable Disease states, “There is no risk-free level of tobacco smoke.” Tobacco smoke causes changes in cells that can lead to cancer. In the lungs, these changes can lead to lung cancer. To reduce your risk, don’t start smoking. If you smoke, quit. Quitting smoking improves your life in many ways and we encourage current smokers to find the best way for to quit. If you (or a loved one) have been diagnosed with lung cancer and smoke, continuing to smoke can, among other things, interfere with the way treatments work and make side effects worse. Click here to find out more.
What about pipes, cigars, and marijuana?
There is no safe tobacco product. All tobacco contains nicotine and other cancer-causing substances. According to the National Cancer Institute, "Overall, lung cancer risks for cigar smokers may be similar to those seen in cigarette smokers once they are adjusted for differences in level of inhalation and quantity of tobacco smoked per day." Pipe smoking is linked to lung cancer but the risk appears to be lower in people who only smoke pipes do not also smoke cigarettes. Not all studies have found a link between marijuana use and lung cancer. A 2006 review of studies, The Association Between Marijuana Smoking and Lung Cancer: A systemic review , concluded there is a “biological plausibility for the enhanced risk of lung cancer associated with marijuana."
http://www.lungcanceralliance.org/get-information/am-i-at-risk/am-i-at-risk-for-lung-cancer/
