Marijuana is a psychoactive drug produced from the cannabis plant. Although the drug has been legalized in some parts of the country, it remains federally illegal. As the potency of marijuana has dramatically increased in recent decades, so have its health risks. Smoking marijuana, which contains many of the same toxins as cigarettes, poses many of the same risks as smoking tobacco. But unlike tobacco, marijuana impairs concentration, coordination, and reaction time and has been linked to depression and anxiety. Marijuana is especially dangerous for young people, inhibiting the development of their brains and increasing the risk of addiction to other substances.