In the United States, yes. Tobacco products, however, have been banned on billboards since 1998 in 46 of 50 states.
https://truthinitiative.org/who-we-are/our-history/master-se...
https://truthinitiative.org/who-we-are/our-history/master-se...
Of course the risk profile of marijuana is arguable closer or more favorable than that of alcohol, so tossing it into the alcohol advertising bin or better makes more sense.