Marijuana may be legal(ish) in Denver, but the neighbors can still call the cops over violations of the odor ordinance.

If the olfactometer says you're over the stink limit, the fine is $2,000.

And, by the way, there's a great article about the difficulties of legalizing marijuana in the new issue of The New Yorker: "BUZZKILL/Washington State discovers that it’s not so easy to create a legal marijuana economy." But you'll need to subscribe to read it. Odor ordinances are the least of it. There are big problems with trying to eliminate the black market. Just one is: Young people under 21 aren't going to be allowed to buy legally, and these are a huge part of the marijuana market. Life isn't going to change for them. Another is that the state is seeing legalization in tax terms, which means it's tempted to overprice — which sends folks back to the black market — and it's getting addicted to a cash flow based on heavy users (because it's probably true that something like 20% of the users will by 90% of the product).