There is a saying: Do you want to die healthy?
I personally think, that some things are just overreacted. Media can blow such a big bubble from a little thing. For example, you can drink, alcohol is a social lubricant. Just do it with caution.
Other things? I think that people do drugs because they want to forget some problems, or just have a good time. Simply like that.
Lack of exercise? It's XXI century you know. Century of laziness:)