Some substance abuse experts are afraid that Colorado's new marijuana law will lead to a rise in addiction. Gary Tuchman reports.
Plus, Dr. Drew and Carl Hart, Columbia University psychology professor and author of "High Price", debate whether pot is a gateway drug.
Anderson Cooper goes beyond the headlines to tell stories from many points of view, so you can make up your own mind about the news. Tune in weeknights at 8 and 10 ET on CNN.
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