I think the link you gave us was to a newspaper article reporting one doctor's opinion based on what he has seen over the years. Whilst I agree that he is a medical expert, one opinion doesn't really make it so.
What it comes down to is "Cause of Death".
Looking at medial data collected between 1997 and 2005 there were still no cases where doctors specified cause of death to be marijuana.
There were plenty of cases where it was the doctor's opinion that marijuana was a "secondary suspect" (may have contributed to a death) - but none (that's zero) where marijuana is given as the
primary cause of death. (Compared with - for example - 2,254 deaths where Viagra was the primary cause)
Source: Deaths from Marijuana versus FDA approved drugs (1997-2005):
https://medicalmariju...ID=000145#cause
I do believe that marijuana use can be dangerous in an indirect way - people do random, foolish things when they are stoned. (Like driving a car, climbing something tall - like a wall or going onto a balcony and falling off ... list of things can go on and on).
I don't believe that just because smoking tobacco or drinking alcohol is legal that we should legalise marijuana. All that means is that folks can put themselves in danger not just when they're drunk or smoking cigarettes, but when they're stoned as well. If anything, that's an argument for stricter controls on alcohol (or smoking) - not that I particularly want this either - I am just saying that the argument is moot in my opinion.
What is all comes down to is that there are plenty of reports and evidence for both arguments (for and against).