It's less public. There's actual fear of smoking in parks, pools, concerts, because it's still nominally illegal. After legalization in CO, public smoking went way up.

I suspect it'll drop down again after the novelty wears off and the public tires of it and wants smoking laws enforced.

But one nice perk of legalization is that it could be written into leases explicitly that smoking in the apartment is in violation of the lease and is grounds for eviction after repeated complaints. It's not a police matter or a "narcotics" issue, it's just somebody being an inconsiderate neighbor.