Marijuana is in the headlines as more and more states legalize it for medicinal use or decriminalize it entirely. In the American Chemical Society’s (ACS’) newest Reactions video, we explain the chemistry behind marijuana’s high, and investigate what scientists are doing to ensure that legalized weed won’t send users on a bad trip.

Subscribe to the series at, and follow ACS on Twitter @ACSreactions.

The American Chemical Society is a nonprofit organization chartered by the U.S. Congress. With more than 161,000 members, ACS is the world’s largest scientific society and a global leader in providing access to chemistry-related research through its multiple databases, peer-reviewed journals and scientific conferences. Its main offices are in Washington, D.C., and Columbus, Ohio.

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