to my knowledge, the 3rd eye isnt accessed when using drugs or substance. instead you’re tapping into varying vibrations of awareness- you need to be completely clean to get to that point of centralized clairvoyance. in most cultures that employ drug use for spiritual guidance- they still observe a fasting/cleansing period. also the mind as muscles, must be trained to properly benefit from drug-induced trance. hence the result of craving and/or addiction for the rest of us.