Everything You Need To Know About THC, Marijuana’s Mind Altering Chemical | Mach | NBC News

It’s 4/20 – the unofficial high holiday. The pleasant euphoria people feel when they smoke marijuana is all because of the main chemical produced in the cannabis plant: delta-9-tetrahydrocannabinol…or THC. » Subscribe to NBC News: http://nbcnews.to/SubscribeToNBC » Watch more NBC…