Google is your friend.... From the Mayo Clinic:
[FONT=Helvetica, Arial, sans-serif]'Pneumothorax can be caused by:
Chest injuries. Any blunt or penetrating injury to your chest can cause lung collapse. Some injuries may happen during physical assaults or car crashes, while others may inadvertently occur during medical procedures that involve the insertion of a needle into the chest.
Underlying lung diseases. Damaged lung tissue is more likely to collapse. Lung damage can be caused by many types of underlying diseases, including chronic obstructive pulmonary disease (COPD), cystic fibrosis and pneumonia.
Ruptured air blisters. Small air blisters (blebs) can develop on the top of your lung. While not considered to be a disease of the lungs, these blebs sometimes burst — allowing air to leak into the space that surrounds the lungs.
Mechanical ventilation. A severe type of pneumothorax can occur in people who need mechanical assistance to breathe. The ventilator can create an imbalance of air pressure within the chest. The lung may collapse completely and the heart may be squeezed to the point that it can't work properly.
Risk factors for pneumothorax include:
Your sex. In general, men are far more likely to have a pneumothorax than are women.
Smoking. The risk increases with the length of time and the number of cigarettes smoked, even without emphysema.
Age. The type of pneumothorax caused by ruptured air blisters is most likely to occur in people between 20 and 40 years old, especially if the person is a very tall and underweight man.
Genetics. Certain types of pneumothorax appear to run in families.
Lung disease. Having an underlying lung disease — especially chronic obstructive pulmonary disease (COPD) — makes a collapsed lung more likely.
Mechanical ventilation. People who need mechanical ventilation to assist their breathing are at higher risk of pneumothorax.
A history of pneumothorax. Anyone who has had one pneumothorax is at increased risk of another, usually within one to two years of the first episode.'
Given the above information, I would say your LSD usage had little to do with it. As to your smoking, without knowing how much or how long, it would be hard to gauge. You also don's say whether or not you were a cigarette smoker.
As to the possibility of vaping, I would think that you should be extremely careful putting anything 'foreign' into your lungs at this time. Just like lung cancer patients are not even allowed e-cigs, I would think that you should avoid all forms of inhaling of any substance. Perhaps edibles would serve you better.
Hope you feel better soon and welcome to the forum. [/FONT]