Just say

I wanted to be like "dude you're on oxygen because you smoke... fuckin' quit already!!" but I suppose once you get that far you just don't give a fuck anymore.
But of course I was thinking all of this while smoking and felt like a hypocrite. I only have 1 or 2 a day during the week. A pack lasts me 2 - 3 weeks so I think im safe.

There is a lot of time left before my next class now and I have nothing to do. I could go and read blogs for the next couple hours by the computer screens here give me a headache.