I know men who do have collapsed lungs and they did smoke tobacco daily for decades, smoked Cannabis either multiple times daily or very frequently like just weekends from joints/pipes/bongs for decades, and had either smoked meth or had used meth by railing it either on just short few day binges or on weekend binges, and have snorted a fair amount of coke over their lifetime.
In their case it happened when they were young and in their late 20s, early 30s or maybe a bit older. These guys are thin and said how they'd met lots of other thin men who have had collapsed lungs before.
I did a simple search for Peneumothorax on google and it said this:
Certain activities may lead to a collapsed lung. These include scuba diving, smoking marijuana or cigarettes, high altitude hiking, and flying.
Tall, thin people are more likely to get a collapsed lung.
I found this here.
Additionally, a primary spontaneous pneumothorax may occur while smoking marijuana, after a deep inhalation, followed by slow breathing out against partially closed lips that forces the smoke deeper into the lungs. But most commonly, blebs rupture for no obvious reason.
http://www.mayoclinic.com/health/pneumothorax/ds00943/dsection=causes
Here's the thread from AusDD.
http://www.bluelight.ru/vb/showthread.php?t=506562
I'm not a doctor but would Vaporization be better than smoking herb if you don't want to get a collapsed lung? Or should you just avoid vaping/smoking altogether or just not do them in excess?
I'm asking since I'm thin and I've smoked herb on/off for about 10 years and I only vaporize now and except for one month in the summer I never really smoked herb daily. I tobacco smoked on/off socially for a few years cigarettes and cigars and I currently don't use any at all and haven't for years. I do however exercise and do cardiovascular exercise.