Smokes pot? Why would 100% smoke pot, there's so many methods to get healthy supplemental phytocannabinoids to your endocannabinoid system, smoking is absolutely the easiest... but best practices would absolutely have a variety of methods to consume the products.
Yes, if 100% of the population supplemented their diet directly through phytocannabinoid consumption (smoke weed,) or through livestock fed on hemp [a historically accurate precedent] then yes 100% we would be a healthier nation. There is no doubt.
There are a tremendous amount of chronic conditions that would resolve overnight. The Healthcare system wouldn't be overwhelmed. Mental health would improve. The justice system would be whelmed instead of over. Millions if jobs would pop up overnight from local grower to local chemist to local sitter/etc.... yeah tremendous overnight change for the better
The only people negatively affected would be the exceptionally small % if people allergic in some fashion to terpenes or phytocannabinoids, which I'm not certain cannabinoids can cause an allergic reaction but I have no idea.
The religious folk would find it easier to release their sins/burdens to the lord, church would be infinitely better by bringing cannabis BACK into the rites as an incense addition....
The world would definitely be lovelier and we would be a better society. No doubt.