> "In my 25 years of practice, all of my patients who came to me seeking help with their addictions, they all had one thing in common - they all started with marijuana."
This might well be true though I doubt it. I strongly suspect almost all of them started with alcohol.
Be that as it may, that's really not the probability we're interested in. It's not "percentage of addicts who tried Cannabis" but "percentage of Cannabis users who go on to become addicts". Given the wide usage, the first number is meaningless, the second likely very low.
Your friend's quote might as well be: "they had one thing in common: they all had a driver's license".
This might well be true though I doubt it. I strongly suspect almost all of them started with alcohol.
Be that as it may, that's really not the probability we're interested in. It's not "percentage of addicts who tried Cannabis" but "percentage of Cannabis users who go on to become addicts". Given the wide usage, the first number is meaningless, the second likely very low.
Your friend's quote might as well be: "they had one thing in common: they all had a driver's license".