Apparently teens in the US are now smoking and inhaling Salvia, a type of mint plant. It it a lot like methanfedamine (sp?) and is now banned in a couple states. Some scientists are disapproving the ban, because they want to test the plant to see if it can help certain diseases.
Even if we were somehow able to completely stop the sale of every illegal substance, people will always find something to get them high. It's been happening since the Stone Age. The Oracle of Delphi in ancient Greece was located on a volcanic vent of hallucinogenic gasses. Opium, some beers, marijuana, all discovered in antiquity. Hell, even TOBACCO was hallucinogenic at one point. Europeans bred the hallucinogenic qualities out of it, but it's still pretty bad for you. It's a never ending cycle. People will always get high, and others will always want to stop them. Do I want people to get high? No. Do I approve of drug use/getting high? No. It's just a fact of life.