Agreed. I value my mind, and my ability to think clearly, so much that I refuse to take any such drugs, or even to get drunk on alcohol. I only have a few decades to use my brain cells (unless we hit singularity). I don't want to burn them out too quickly.

Personally, I consider the neuroscientist who actually studies, thinks and experiments on the brain to have more credibility than the stoner telling me all about god is the universe and truth and love.