Seniors, what makes kids start smoking?

I wouldn't say peer 'pressure' exactly. None of my friends tried to talk me into smoking...I started on my own. It's hard to say what makes some kids start and not others. My mother smoked like a chimney, my dad didn't smoke. My brother and I started smoking at very young ages (14-15), my sister never smoked. Neither of my (ex) husbands smoked...and neither of my kids do either...thankfully. I thought for sure my son would start smoking at some point because he was always a 'wild child'...but he can't stand to be around it.