In soc class.... Smoking is can be a lot worse than pot in the long run... So why is smoking legal and pot not? Because Smoking doesn't impair the fuck outta you when you do it. The last guy I spoke with who was high.. I coulda gotton his credit card number if I tried.... and all the passwords needed.
as for the breathing thing? Phaenx just pointed out that by THAT kind of logic its bad. But then again.. have you ever breathed in SO MUCH AIR that your lungs exploded? No, but if you did, that'd be bad for you...
Have you ever drank so much liquid that you threw up? I almost have, and that "would fall in the bad things category." To follow that logic, Jumping would be bad for you.. Sure you jump alot, but have you ever jumped.. where the floor was 100 feet lower than where you left off?
See... all the debates about that is completely off-topic.
As for being ON-topic. There was a guy in my math class that did a lot of shit. Oh sure, he was still smart. He'd sit in the back of class and the prof would ask him if he was even paying attention, and there infront of him, he had everything done (and correctly I might add). Was this due to him doing pot? Fuck no. so Did pot impair him in math... probly not. How was he outside of this? VERY SPACED OUT. There are other accounts I have had with people who WERE NOT idiots before hand, but afterwords........ they weren't quite as smart as they used to be.