Never said it was addictive, so don't know where that's coming from...

I know you'll think I went to anti-marijuana sites to get this data, so I'll tell you exactly how to get to it.

https://www.ncbi.nlm.nih.gov/pubmed/ This is the US library of medicine National Institutes of Health, where independent researchers show their experiments and results. Now let's go to the search bar and type in "cannabis smoking lung" and grab say, the top 3 to show up, these are all conducted/published in 2016 so they are recent, and remember this is just the top 3, not any that are handpicked by me, just what's recent.

Cannabis smoke... causing symptoms such as increased cough, sputum, and hyperinflation... Cannabis can weaken the immune system, leading to pneumonia... Based on immuno-histopathological and epidemiological evidence, smoking cannabis poses a potential risk for developing lung cancer. At present, however, the association between smoking cannabis and the development of lung cancer is not decisive.

Okay that's just 1 article, maybe a fluke, to the next one

Forty-eight articles were collected and categorized by respiratory effects. In particular, lung cancer, bullous emphysema/COPD, and other respiratory symptoms were the primary categories... The research indicates that there is a risk of lung cancer from inhalational marijuana as well as an association between inhalational marijuana and spontaneous pneumothorax, bullous emphysema, or COPD. A variety of symptoms have been reported by inhalational marijuana smokers, including wheezing, shortness of breath, altered pulmonary function tests, cough, phlegm production, bronchodilation, and other symptoms. It is important to stay current with research findings to educate patients on this smoking behavior.

Okay maybe the top 2 independent articles are biased, let's look at the third one.

Marijuana, when used as a medical treatment, should be held to the same standards as any other drug coming to market including investigating the adverse event profile and ensuring a rigorous quality control program... Therefore, we have the obligation to our patients to ensure that we are recommending a safe and effective drug.

There ya go, the final one says we should fully understand what we're putting into ourselves and others body, especially when it's a drug. I mean technically that isn't saying it's bad, but it's saying we don't know that it's good and we should research more.