That's always a question of proportion. It's all in the mix. It's sure carcinogenic and surely beats the lung up in a lot of ways. It also does statistically, by my own observation, lead to a significant lack of all kinds of activities.
For example, it frequently leads to a lack of believe in - or even just consideration for - how terrible substance consumption is, over all if not for the sake of nutrition.
Also if you are prone to developing a psychotic disorder (prevalence of psychotic disorders is ~3%), pot consumption before the age of 20 increases the chances of it happening.
There are plenty of sources and the original papers are easily found, but there isn't a proper bibliography with links which I agree is frustrating. For example the first one says the last name of the author and the year: Andreasson and 1987. So I googled "Andreasson 1987 cannabis" and found the article:
