I mean your lungs are probably too full with marijuana smoke to hold oxygen properly. I recommend taking up swimming, since all the deep breathing does wonders for your respiration.
After 2-3 weeks your body is completely as it was before you started smoking, lungs and all.
You know I've been thinking about it, and I'm not entirely sure what I read said exactly that, it might have just been talking about reactions and something else similar. Smoke is still smoke so it makes sense, although now I do remember a study where they were doing them tests where you blow into a tube with that ball in it and cannabis smokers scored higher, what the conclusion was I don't remember though. Dammit this is gonna bug me, **** I wish I didn't put my laptop to factory settings and lost all my damn links. I do know that light consumption really has no effect, but imma heavy smoker so there probably is. I thank you for renewing my interest in the science of cannabis sir.
edit: no way I have not been here for 5 ****ing years. thats crazy man
edit2: wait it's been about 4 I think, december of 06 yeah 4. still thats crazy and all that
edit3: this tea is ****ing good man, jesus christ