I understand where you are coming from but I don’t think monthly limitations for e.g. alcohol will reduce casualties. It could even achieve the opposite. 50 bottles of beer/month would suffice for most of the population, but would also push heavier drinkers towards an unregulated black market with all of the negative side effects. Just think of methanol poisoning via homemade moonshine.
Back to cannabis: Black market dealers won’t offer you help to reduce your consumption or make you reflect about your usage. Dispensaries or CSCs on the other hand could fulfill this role. And lastly, there are peope who function just fine and live a “normal” life while smoking >2g of weed a day. It feels unjust to me to still criminalize these people, as they potentially will only harm themselves.
You could prepare healthy snacks before (!) smoking.
some inspiration:
-vegetable sticks with hummus/guacamole
-fruits (frozen grapes are awesome)
-roasted chickpeas
-popcorn (without drenching it in butter)