Here’s the straight dope from young science writers at Wake Forest University. In an up-to-the-minute graphic novel format, no less. Each graphically supported factoid raises as many health and policy consequence questions as it answers. But it gets the science out there is an accessible way.
The scientific question not addressed here: Does commercialization and marketing/messaging drive higher rates of use and addiction? Why or why not? (Nora Volkow has hypothesized/stated that commercialization and advertising do indeed drive higher rates of use and addiction.)
See it at the source at Scientific American.