I've read that study and the German study of 15,000 is considered more valid although not as PC or palatable to the masses , it comes to the basic same conclusions but they found a direct correlation to mood and anxiety disorders.
Here is a similar study but it's not as detailed in my opinion as the German study but along the same lines
https://www.bmj.com/content/342/bmj.d738
Take note of the What is known about MJ use.....Cannabis Use is associated with increased risk of psychotic disorders....Cannabis use precedes the onset of psychotic symptoms in individuals with no history of psychotic experiences.
Also the death rate of Reefer use or in contribution is also harder to determine than Alcohol because of the use of both in cases of death and or the lack of testing sometimes for cannabis at all. And no long term study has really been done on the correlation to Pot and Cancer. It's suspected that long term use like Tobacco use can lead to a increased risk of cancer.
As a society we work hard to Demonize Liquor and tobacco and Elevate Pot to a Heavenly status and that a horrible lie.
And believe me I'd say a good 50-60% of the mental healthcare workers use Left handed cigs.....My current Manager and Previous Manager use openly, but they freely admit the studies I have pointed out are valid and the risks are real. Heck I giggle sometimes when I hear my peers who I know smoke reciting data and info. from the studies to our Patients in a effort to curtail their use of all street drugs and the abuse of Legal drugs.