[s73v3r_]

"I never understood why anyone young would start smoking"

To look cool.

No, seriously, that's one of the main reasons. To look cool in front of one's peers. You might not have cared about such things, or feel pressure to engage in them. If so, I'm happy for you. But that doesn't mean others don't.

[bonesss]

Superficial habits are also an easy substitute for personality, something teens are eagerly trying to develop. Everything from hair dying to wearing bow ties are 'normal', vices carry all kinds of extra social signaling.