Yea calm potheads that try to quit for a while have tha tendency to get pissed easily. But if ya keep it up and youre used to not having a smoke session in your day, once you get over tha "damnit i wanna smoke so bad" phase you start doin other shit to keep your mind off it and you may find it a bit easier.
Me myself...I dont know if I could do it...I tried once. But it obviously didnt work out to well.