Hallucinogenic drugs related to intelligence

A big part of our society is based around drugs. Through my perspective it appears as if people who do/have done hallucinogenic drugs are more intelligent than people who haven't. This may be related to my definition of intelligence but from what I've seen and the people I have interacted with who have done these drugs usually have a better understanding on many subjects. Its as if they allow us to see what's not there, causing us to furthermore question what could be there.