Smoking anything can cause lung cancer and can potentially injure the lungs, maybe even permanently. Smoking marijuana is not exempt from this. Marijuana itself may be harmless, but ingesting it via smoking is not the safest way to consume it. There are other methods that are much safer. Smoking is bad.
In the long run, any amount of smoke that collects in your lungs is bad. One of the only anti-pot ads I've ever seen on TV that was true was, pot contains 4 times as much tar as tobacco. In my youth, I only needed look at the inside of a pot pipe to know that's true. While I don't believe it's as bad for you physically as alcohol, there's no way that smoke in mass quantities is good for your lungs.
As scientific studies have shown so far smoking marijuana does not cause lung cancer, and does not permanently injure the lungs. It does irritate them as you are inhaling smoking and can cause stress to the brochinle tubes, but the damage is not permanent and can be reversed with either medication or by stopping.
Smoking, regardless of the substance, is harmful to one's health and has the potential to cause cancer. In this regard, it is completely possible for the habitual smoking of marijuana to cause permanent damage to the lung's. The only way to prevent damage to the lungs as the result of marijuana is through alternate ways of ingestion.
I don’t think that the regular smoking of marijuana causes
lung cancer or in any way permanently injures the lungs. Smoking marijuana is nothing at all like
smoking tobacco. Many tobacco smokers
eventually get lung cancer or other breathing complications, while many
marijuana smokers seem to have no negative cumulative effect.
Marijuana does not cause lung cancer, as every study as shown. The attempts to tie marijuanas effects to cigarettes is a desperate attempt to keep marijuana illegalized in the face of Colorado and Washington's legalization of it. Ironically, these same people are not pushing for banning tobacco but under their logic they should.
Smoking in general usually causes harm to the lungs, but as far as I remember Marijuana did not cause lung cancer, or have serious injuries on the lungs. From what I do understand is that Marijuana is more likely to cause brain issues after a long term effect for quite a while.
Marijuana is thousands of years old... Discovered by a Chinese country or state way back when. They used it for medical purposes, and those with pain or other illnesses have used it routinely and none have died. Excessive smoking of it (equivalent to 2 packs of cigarettes a day) might be a bit obsessive and may cause damage, but routine smoking a bowl or two a day is not going to harm you.