Seth Rogen "smokes a lot of weed" when he writes movies.

The actor-and-writer admits he relies heavily on marijuana during the creative process of a film because it relaxes him and takes away the pressure.

Seth - who wrote and stars in new movie '50/50' - told MTV News: "I smoke a lot of weed when I write, generally speaking. I don't know if it helps me write. It makes me not mind that I'm writing. And I don't know if it makes me work better, but it makes me not care that I'm working. Who wants to work? But if you're stoned, it doesn't seem like work."

Seth says smoking cannabis is nothing new to him as all his friends do it.

He said: "I think a lot of people smoke weed. I think way more people smoke weed than the media likes to acknowledge. Maybe it's just the people I'm around, but I don't think so. Pretty much everyone that I know smokes weed sometimes - with the exception of my parents."