I see your one study and raise you dozens of studies on health risks.
https://scholar.google.com/scholar?q=marijuana+health+risks&hl=en&as_sdt=0&as_vis=1&oi=scholart
You really want to use a study from the UK, one of most restrictive “free” countries on populace freedoms, to make a point? Last I read, they’re arresting people there for non-threatening speech on social media, and I don’t think you can actually own/carry even a pocket knife?
In all seriousness, I’m not sure I want folks who can’t remember which is the brake pedal before accelerating through the front of businesses using substances that further affect their cognizance.