Why younger generation has become so health-freaky?

Is it me or the youngsters in this decade, are fitness obsessed, anti-smokers, anti-drinkers and follow a so-called healthy diet?

I rarely meet any young person who smokes or drinks, most of them are 35 or more.

I don't know about you... but that's how things are where I live. And I'm afraid it happens in most parts of the world now.
Why younger generation has become so health-freaky?
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