a study has been released arguing a one joint per day habit (measured over twenty years) doesn't decrease pulmonary function. Just a new study I thought you might be interested in
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The article said that heavy smoking will effect the lungs over tim but not as much as cigarettes would. There are obviously short term irritations like coughing. Once I have internet back at the house I will find and post said study it time Warner suxs
Also it said more irritation comes from the papers and briefly talks about vapeing
here you go guys
and here are two articles about the journal: NY Times and Time
Just thought it was interesting, published in 2012 so actually not really that new, you may have already seen it. But it has a pretty large population and it is longitudinal. There weren't a lot of heavy smokers in the group, which makes it harder to compare for people that smoke A LOT (there is indication that is would be detrimental, as expected, but perhaps not as much as tobacco), but as far as moderate smoking goes, very interesting.