i think he might have smoked too much of his new batch without testing its potency first. Alot of people dont say u hallucinate from marijuana, but if u have a low tolerance and smoke ALOT it can happen. i dont think i can get to the point of it being like taking acid, shrooms, pcp, etc. but i can be tramatizing. I would just tell him to smoke smaller ammounts until his tolerance builds up to his new marijuana.