But a psychoactive substance weed can exacerbate paranoia or delusions in someone who has it. We were supposed to meet up last night. At first, based on his responses, I thought he was giving me poor, illogical excuses as to why he couldn't make it. If he isn't lying, it's worse. I know he has some mental issues from a motorcycle accident and some other trauma, but I'm not sure what he says is true.