From the Internet Movie Database:
Determined to find out the true effects of marijuana on the human body, stand-up comedian and former Stoner of the Year Doug Benson documents his experience avoiding pot for 30 days and then consuming massive amounts of the drug for 30 days. More than just an amusing story of one man's quest to get superhigh, this documentary also examines the hotly contested debate over medical marijuana use.
From Wired and a review by Jenna Wortham:
During the post-screening Q&A, however, Benson was quick to point out that the film doesn't exactly glorify pot. "I looked like a total idiot," Benson told an audience member who lectured him for "only showing the positive sides of pot."Unlike the follow-on to Morgan Spurlock's month-long fast food diet in Super Size Me, I can see thousands of college students, along with a the entire population of expats in Amsterdam, trying to duplicate Mr. Benson's efforts.
"And I gained 8 pounds," Benson added.