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"Smoking is in no way less bad for you if done out of doors."

That's not true. If you live in the house of someone who was formerly a heavy smoker then you have a higher cancer risk yourself, because the radiation from the cigarrettes gets into the walls and carpet. Which means that smokers themselves also have a lower cancer risk if they smoke outside for the same reason. I'd imagine it also somewhat reduces their risk for heart attack, since second hand smoke increases your risk of heart attack, although I haven't seen any stats on that.

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