Medical marijuana: What does science say?

Now watching

Next video starts in : 7 Play

Medical marijuana: What does science say?

Medical marijuana: What does science say?
Replay video
Up next

Modern Vernacular

Unlock your personal NFL Now stream by signing in to NFL.com

Medical marijuana: What does science say?

by CBSTV Videos 5:44 mins

More states are legalizing medical marijuana but Dr. Margaret Haney, director of the Marijuana Research Laboratory at Columbia University, tells CBS News' Kera Rennert that scientific evidence for the drug's medical benefits is lacking.

View Comments (10)