Y do relatives smoke?
Answers: I have no hypothesis! There are no positives to smoking, but maybe that's why a smaller amount people are doing it. I know that most ancestors start smoking when they are teens. Teens tend to not think in the region of future condition effects, and are more likely to do something because peers do it. Once you conquer 18 (the legal age for smoking) you are seriously less imagined to start smoking, and your chance decrease more every year.
That's my only guess.
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