I get your point, but i'd argue it's still dumb to normalize and encourage 15-16 year olds. Their brain is still developing and a lot of kids that have cannabis experience significant issues later; higher chance of developing depression, poorer cognitive performance in memory and learning (even with extended abstaining). The more its studied the more issues seem to be found so.. it's really not worth it, just wait until you're an adult with a fully-formed brain - you can't make good decisions prior about taking stuff that will permanently affect your brain and body health. Same goes for alcohol.

Brain changes: https://pmc.ncbi.nlm.nih.gov/articles/PMC3930618/

Overall health: https://pmc.ncbi.nlm.nih.gov/articles/PMC10165991/