Must just be your brain chemistry mate...
I don't know your situation but Unless I had a serious medical condition, If I freaked out smoking weed or got paranoid I'd quit...
Edit...
I don't really see the need for your sarcasm about my comments, what sort of person would I be if someone was saying that they freak out and get paranoid smoking marijuana and I said just smoke more weed... I'd be a complete fuck head if I did that... Smoking weed is not for everyone... I'm not saying that you shouldn't smoke, or don't need it for whatever... just that it would be irresponsible of me as a person to tell people who freak out and get paranoid to keep smoking weed...