I believe this. I also believe that it's an indirect cause.

Curious how many people who use both cannabis AND amphetamines develop type 2 diabetes.

I suspect it's a smaller number.

Cannabis causes obesity in some, due to its impact on appetite. Do we need to draw out links to everything that we already know obesity causes and act like this is somehow interesting information?

In my experience regular cannabis use drastically reduces appetite and weight to the point it's like a weight loss drug. I've met others who have the same experience.