David Arquette has been talking publicly lately about his past drug problems. The actor (who's engaged to "Friends" star Courteney Cox) says he's been off heroin for two years. "It's a horrible, evil drug," Arquette tells Premiere magazine. "It wipes away all your problems from the surface, making them so much worse on the other end ... It has taken way too many lives. There's no good times on heroin, no family, no friends."