nah, everytime I smoke sativa heddies I see a blue/purple luminescent aura around things (like doors, desks, people, etc.).. sometimes it is extremely faint, if I smoke enough it will get to the point of yellow road lines being purple.
THC is a psychedelic, I think many people undermind its ability.
tom__420 it is quite possible.. I believe the hallucinogenic dosage of THC is 15-20mg's. How old are you again?