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Does smoking really kill you?

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My question reagrds smoking as the title says. You see, I have A LOT of family/friends/people I care about who happen to be smokers. My grandparents have smoked for as long as I can remember, my uncle smokes, my dad use to smoke but he hasn't done that in YEARS now, and several of my friends smoke. My question is does smoking REALLY kill you/cause serious harm? Because my grandparents and uncle smoke and they've never gotten cancer or anything like that and obviously haven't died. So what's the deal with this? Can someone please help me? I'm scared, I mean I don't want to loose any of my friends/family members just because they smoke! And I'll even admit that I, myself have in fact thought about starting to smoke SEVERAL times. Should I start? Also, what effects does second hand smoke have on people? Any help will be greatly apperciated, but I really need as much help/info as possible guys *and gals (: *.