ur memory will prolly suffer a lil. when i used to smoke every day and i tried to memorize stuff dfor school id usually forget it but its not that big of a deal, if u memorize hard enough ull rember, andddd..if for some reason u dont smoke one night and u try to get to sleep u wont fall asleep till way later, it becomes so hard to sleep, and...hmm..yeh ur lungs will hurt if u run or soemthin like that...anddddd yeh, ull prolly put on a lil weight lol, but other than that, its not that bad...just little things, nothin big