I’m sure they do, but just don’t admit to those naughty things. Not to say how much of a party animal Emma is behind scene. Have you guys seen the pictures of her smoking with Tom Ducker? Ha!

Anyways, here’s the article that was published on exposay:
“Harry Potter’s” young stars have confessed to drinking and smoking. Daniel Radcliffe, Rupert Grint and Emma Watson, who play young wizards Harry Potter, Ron Weasley and Hermione Granger, say they have experimented just like all other teenagers.

Emma, 17, said: “You are careful not to do it in the public eye. You have your first cigarette or first glass of alcohol in a safe environment with your close friends - or you could be foolish and choose to do it in a London nightclub.”

18-year-old Rupert added: “Because we are quite busy we do miss out, but we still have those kinds of experiences like getting drunk for the first time.”

Despite enjoying going out, Daniel, 17, says he always puts his work first. He revealed: “What I enjoy most is the acting and the work, but it doesn’t stop us from having a party once in a while. Parties are fine and fun.”

In the latest film, “Harry Potter And The Order Of The Phoenix,” Daniel has his first on-screen kiss with Katie Leung, who plays fellow Hogwarts student Cho Chang. But he admits he wasn’t nervous as nothing can touch the nerve-wracking experience of appearing naked on stage, which he did in West End hit “Equus’..”

He said: “Once you’ve been on stage naked in front of 1,000 people you really feel you can do most anything without inhibition. The kissing was fun but less sexy than I imagined. We probably got it right on the 30th take!”

Old but great!