I'm really sensitive to cannabis; low to moderate doses of it leave me unable to speak coherently, mess up my coordination, give me shakes and closed-eye visuals consisting of bright, shifting colours and do something to my sense of balance that makes me feel like I'm on a roller coaster. It's also done other weird things to me on occasion; one time it turned my skin into one big erogenous zone and gave me a pre-orgasm sensation wherever I touched myself, though I was with a group of people at the time, and thus didn't fully explore the possibilities. I find cannabis too intense and incapacitating to use regularly, but it's interesting to take on rare occasions.