30 u start tripping balls, youll have this dream that your like talking to some army general and then ull wake up and ull be sitting on a curb moving ur lips. make sure u have someone to baby sit you while on it because u cant control urself. and dont go around parents because its so obvious that ur fucked. ive done 15 but i just ate and i felt it after an hour. it wasnt that strong, i couldent talk very well and i wanted to lie down, i kinda felt sick... if ur experenced with drugs try it, if ur like me just stick to weed