Why does marijuana make users more relaxed, or even euphoric? Why do stoners drift off on suprising, imaginative tangents -- and feel like their often bizarre ideas are true epiphanies? A short, informative video from the web series ASAP Science explains the chemistry of getting high. Watch and find out how THC, the psychoactive molecule in cannabis, resembles neurotransmitters to interrupt the normal behavior of brain cells. Mitchell Moffit and Gregory Brown, who produce the videos, talk about the making of the series in an interview with the Atlantic Video channel here.