I can't really give you an explanation about illicit drug use and the impact on the psyche...I've neither studied illicit drug use nor partaken of illicit recreational drugs, not even pot. :shrug:
Who says they're illicit? That's good though, that you dont know about mind enhancing drugs. Next time someone claims they had some spiritual experience you can't say they were trippin on LSD. Just admit you can't give an explanation about their experience.....