Marijuana effects everyone in different ways. It does make a lot of people paranoid, and I remember myself a few times where me and a few buddies would get paranoid over some overheard noises in the middle of the night, or anything that involves a possibility of getting caught. I think its all a bit of a placebo though, as the only reason anyone would get paranoid in the first place, is because they have a fear of getting caught. Experienced smokers not only build up a tolerance, but also notice a decrease in unwanted side effects.

For instance, I feel like after experienced use of the herb I can fully control my high. I also don't get munchess anymore, and if anything suprisingly I sometimes feel like smoking supresses my appetite for the period of the high.