get lunesta for a co-pay as low as zero dollars at lunesta.com discover a restful lunesta night. welcome back. now a warning for all parents about a dangerous new drug teens are using. this one neither of us had even heard about. it's called synthetic marijuana. >> it's especially scary here how easy it is to make the drug. its ingredients are legal in 37 states and very easy to find. pierre thomas reports. >> reporter: 20-year-old paul hallsteader's life fell apart after he became addicted to a powerful new substance racing through the suburbs of minneapolis. >> once you use it once you have no control over how much you're going to use. >> reporter: most parents would never suspect this new high is perfectly legal. something they may have even seen on their teenager's dresser. it's called synthetic marijuana. also known as k2 or spice.