In my state, supposedly about 1/4 of the retail price is sin tax. In dollars, that's about $400 million last year, or about $32 for every resident, or 0.7% of total state revenues.

I think I'm OK with that? If people were consuming enough cannabis to make a really sizable impact on the budget, the bulk of the effect would probably be not so much a result of increased excise taxes so much as because of plummeting income tax revenues from everyone being too stoned to hold down a job anymore.

In short, hoping for a really noticeable budgetary impact from recreational cannabis legalization is probably a "be careful what you wish for" situation.