Maverick filmmaker, Kevin Smith said he's concerned about his longtime co-star and buddy, actor Jason Mewes, who is the subject of an HBO documentary about Mewes' heroin addiction.

Mewes, who is best known for playing a fast-talking, pot-smoking drug dealer in a slew of Smith's films, turned himself in and plead guilty this week to six counts of violating his probation for a 1999 heroin conviction.

His personal manager, Craig Veytia, who is also producing the show called Rock Bottom, told the Asbury Park Press that said he convinced Mewes to do the program so that people could have a better understanding of his life and drug addiction.

"I'm all for Jay trying to put his life together," Smith told The New York Post. "I've been taking a tough-love approach with Jay, telling him I wouldn't hang out with him or work with him until he cleaned up," he said.  "If the idea of a camera following him around impedes his drug use, that's great. But at the same time it does seem kind of exploitative."

Smith said he hasn't spoken to Mewes in months and now has his lawyer trying to contact Veytia to find out more about the project.

Smith and Mewes have starred in Clerks, Mallrats, Chasing Amy, Dogma and Jay and Silent Bob Strike Back. They also appeared together as a cameo in Scary Movie 2.

Rock Bottom is reportedly slated to air on HBO this summer.

HBO officials declined to comment.