Pot isn’t exactly the hill to die on. Pick a better battle. Pot smokers are usually always morons that are too stupid to not smoke pot.
Since the battle is going the legalizers' way, with more states legalizing every election cycle - including red states Alaska, Montana, and South Dakota - your advice is better directed at the nanny-statist Reefer Madness bitter-enders. Individual liberty is good policy and good politics.
Yes, pot users are morons and stupid. While their ruining of their own lives is their own business, the risk and damage to society and individuals by their actions is a matter for all of us to contend with. There is no upside to pot use.