- Every year of smoking causes DNA mutations that make cancer more likely. If you're smoking a pack per day, the DNA in every cell in your lungs acquires about 150 NEW mutations per year. Organs with no direct exposure to tobacco smoke are too affected. http://www.latimes.com/science/sciencenow/la-sci-sn-smoking-cancer-mutations-20161103-story.html 9 comments science
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