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<< Because those activities have no impact on public health in general, only on an individual's personal health. Big difference. >>
Oh no? What about the drain on medical resources by diseases due to being fat? How does that effect others that need those same medical resources. How about STD? I guess that's no big health issue. >>
Oh, excuse me, no DIRECT impact. Better?
This isn't about prosecuting people for their vices, it's about controlling addictive substances that have a direct impact on public health.
You can be fat and pass STDs all you like, if I'm practicing safe sex and eating healthy, I won't be affected.
However, if I drive on the road I am at risk of being hit by a drunk driver. If I'm at a restraunt, I'm exposed to cigarette smoke. If I live in an apartment next to someone who smokes, I'm exposed to cigarette smoke. If I walk into a building and people are smoking outside, I'm exposed to cigarette smoke.
If a pregnant mother smokes, her child's health will be impacted. If parents smoke in the house around their children, they will be exposed. In LA, 1% of the ambient air is composed of cigarette smoke. Even if you don't smoke, you're exposed.
Hence, this is a public health issue.