Originally Posted by birdgirl73
No, I've not seen any research on permanent symptoms, either. Except that if people already have, say, asthma or a tendency toward bronchitis and they find weed smoking makes those particular conditions worse, the asthma and/or bronchitis themselves tend to be permanent problems, if you see what I mean. That is, people with those conditions tend to have ongoing or recurring trouble with them. So weed smoking, while it's occuring in conjunction with asthma or bronchitis, tends to add fuel to an already burning fire, at least while it's happening.
If you don't have any existing pulmonary concerns and you successfully handle cardiovascular exercise, you're probably in good shape. I still maintain that it's the THC and other cannbinoids that are the beneficial compounds on the lungs, however. Most of what I've read says it's the THC that has the protective effect where cancer is concerned. And there's a lot of other stuff in burning cannabis in addition to cannabinoids. We've left out the whole area of potential cardiac complications (do another Google search on cannabis and heart attack risk), which, of course, has pulmonary implications, too. But you're young and probably aren't at increased risk of heart attack right now.
If you're concerned about your pulmonary health, it'd be interesting, especially if you know a respiratory therapist or some sort of physician who deals with pulmonary matters, to periodically measure your vital (lung) capacity. They have you blow into a spirometer machine, and it tests your lung volume, basically. We all tend to lose lung volume as we age, and cigarette-smoking, pulmonary inflammation and infections, and allergies can cause that to happen faster. Sounds like you don't have any of those things. It'd be interesting, as a regular weed smoker, for you to see whether you personally experienced any diminishment in your pulmonary capacity over a period of years. Then you would have studied yourself and could write up those results!