Video: Eric Roberts on Seeking Help for Addiction on ‘Celebrity Rehab’

Once an Academy Award nominated actor and blockbuster film star, Eric Roberts is telling ET about checking into "Celebrity Rehab with Dr. Drew," and his struggle to understand addiction and successfully "wipe out" his use of pot.

"I smoke pot, and it's the only thing I really have in my life that I consider to be not-quite-a-positive, and I'm trying to wipe it out…," Eric tells ET. "I'm also a big fan of Dr. Drew. I think Dr. Drew is the man, and I get his time for free, and so I’m taking it."

Eric says joining the cast of "Celebrity Rehab" is "an education, and it's a wonderful enhancement to what I don't have…clarity on addiction, about the understanding of it, about the understanding of how to get rid of it."