K2 is an herbal and chemical compound product that affects the brain just like marijuana when smoked. K2 is most often sold as incense and the high in K2 comes from synthetic cannabinoids that act like THC the active chemical in marijuana that affects the brain and causes the high. Some experts say K2 is 10 times more potent that regular marijuana, so less is smoked to get a greater high effect. The big selling point is "with K2 you will not fail a drug test when you smoke it." Not true says Any Lab Test Now, who has a specific K2 test that check for at least four other chemicals as well.