I've seen research that smoking can impact the brain development of adolescents, but nothing that shows it permanently impairs the cognition of adults. Please post that research, I'd like to take a look at it.
As for lung cancer, that's a straw man, vapes and edibles make that a non-issue.
You can't stop people from being stupid and self destructive, just look at the prevalence of obesity. If the law required that people eat beans and kale, there would be a lot less obesity, but would you really want to live in that society?
There's evolutionary reasons people prefer less healthy food. Obesity and weed smoking are not equals. You have to go out of your way to get weed. You can become obese with passive inaction.
Smoking WHILE on cancer therapy: "A number of small studies of smoked marijuana found that it can be helpful in treating nausea and vomiting from cancer chemotherapy."
Anti-cancer benefits: "More recently, scientists reported that THC and other cannabinoids such as CBD slow growth and/or cause death in certain types of cancer cells growing in lab dishes. Some animal studies also suggest certain cannabinoids may slow growth and reduce spread of some forms of cancer."
I was blown away when I first discovered this. I smoked weed when I was younger and my only gripe about it was the possibility of lung cancer. Luckily my non-weed-smoking friend debunked that for me. Props for spreading interesting info!
As for lung cancer, that's a straw man, vapes and edibles make that a non-issue.