I know that one of the drugs that has risen to the top as being extremely popular—and I can't tell you if it's specifically with very young children, teenagers, or young adults—is OxyContin. In the last several years, that has arisen as a drug of serious concern.
As of a couple of weeks ago, the Canadian Association of Chiefs of Police met and discussed these drugs as an issue. One of the drugs mentioned as a sort of an up-and-coming drug of concern was fentanyl. Fentanyl is an opioid that is extremely powerful. The chiefs expressed some serious concern about this particular drug, although it's not nearly as prevalent as OxyContin.