That is bullshit.. You shouldn't need to quit to get good grades my wife's cousin has smoked since he was a wee lad she said she cant remember but is pretty sure he started back in junior high and has maintained straight A's to this very day and hes an accounting major in college now. It's all in the head. You should be able to keep both separte and not let it affect your grades. Tell yourself and apply yourself man.. It is possible. My wife has witnessed it all her life. :thumbsup: