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What's the difference between life expectancy of cigarette smoker and general population?

Some say that smoking cigarettes will shorten lifespan. By how many years is the lifespan of a typical smoker shortened? What are the common cause(s) of death among smokers? Are there any known ...
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1answer
38 views

Is there a scientific proof that smoking spoils face skin?

I saw that cigarettes-smokers (more than 3 cigarettes per day) often have the skin of the face which is a little bit spoiled. Is there any scientific proof that cigarette smoke (or the nicotine ...