Aaaaah, tá explicado...

A culpa é do café!

If you're not alarmed by this situation because you think coffee is no big deal, you must not be aware of the fact that the Center on Addiction and Substance Abuse has identified caffeine as a gateway drug. Last year it reported that "girls and young women who drink coffee are significantly likelier than girls and young women who do not to be smokers...and drink alcohol."

Estava aqui mas a dica foi do Pedro Dória - procure o link aí ao lado que eu estou com preguiça!