Everyone gets paranoid about things. Best advice is to just chill and enjoy the good things about being high.

However, if you're paranoid about getting too high, then don't smoke that much, know your limits. (By "testing" them.)

Believe me, once you get past the fear of the unknown in smoking, everything gets that much better. I remember back in the day when I would be trippin' out after a weekend of the ganja. Now it's practically every single day...