There are also legitimate medical uses for THC and CBD unlike alcohol and tobacco.
Most studies on legalization show either neutral or positive effects on the states where legalization has happened in a number of areas.
I don't think that "young people" should be using, any more than they should be using tobacco and alcohol. Saying that 16 year olds shouldn't smoke MJ is like saying 12 year olds shouldn't drive cars. Totally agree, of course.
If it wasn't Easter, I'd pull together more of the stats and studies, one study showed a 25% percent decrease in opioid overdoses in places where THC has been legalized.
People are going to use THC whether it's legal or not, specifically here in Iowa, you can now just go to Illinois and buy it, which is why the resistance to legalize is dumb. Iowa will be surrounded by legal states before long.
Final thought: I always chuckle at question 11e on the background check form to purchase a firearm, "Are you an unlawful user of, or addicted to Marijuana...". C'mon now, that's just funny and reflective of the "reefer madness" silliness that led to our failed war on drugs.
Link: https://www.healthline.com/health-news/states-with-legal-marijuana-have-fewer-overdose-deaths-082614