I become old irritable me when I'm not on something, plus I have less motivation to do things and I think WAY TOO MUCH. When I'm fucked up on something, it gives me something to focus on even when I'm not doing anything, so it's easier for me to tolerate people, do things without being cynical, etc... Honestly sometimes I think I have legitimate attention problems, and weed definitely helps me with those if I have 'em, I've even been told I have depression and could have ADD by my doctor, but I am not so sure I believe either ADD or depression are really huge things like everyone makes them out to be. Like, it's probably not a mental disorder maybe I just need to fucking exercise and eat right haha xD At the same time though, no matter what point I've been in during my life I ALWAYS have memory and attention problems, regardless of drugs or not.
Also, I've been almost positive I have Irritable Bowel Syndrome, marijuana alleviates a LOT of constant stomach problems for me and I'm not exactly old.