All we can do is play the odds. The effects of alcohol and pot are well known.
IMO, repeal is a nearly painless way to lay off thousands of bureaucrats and reduce corruption.
Can you imagine the day, say in fifty years, when it will be customary to plant hemp around flagpoles, as a symbol of the people overthrowing a corrupt bureaucracy? Could happen.
I could have imagined it when I used to smoke pot. Getting sober does funny things to the mind, though. Somehow I can no longer see pot as the locus of liberty.