3. Synthetic Marijuana

An unflinching look at Spice, also known as synthetic marijuana, K2, Moon Rocks and Black Mamba. This drug is wreaking havoc in communities across the country. The DEA has called it a "poison," the NYPD police commissioner called it "weaponized," and until a few years ago, it was available over the counter and was the second most abused drug among high school students after pot.