Do you have any opinions about herbal incense that people are smoking to get a legal "high"?

It’s all the rage here with the teens and even adults. They smoke it to get a marajuana-like high, even though the package states that it is“not for human consumption”. It is sold as if it is organic (listing several flowers etc in it’s ingredients), but studies have shown that it may be spayed with a synthetic THC substance, which causes the high. Apparently, it does not show up on drug screens and you can get it at any head shop.