Open or public consumption of marijuana is illegal in Colorado and can result in a $100 citation. Places you cannot consume transportation facilities (trains and bus stations, for example); parks; music, sports, and amusement venues (not that many of those are open). You cannot smoke marijuana — or anything else, for that matter — indoors in any public facility, including restaurants, theaters, or office buildings. Although new state law allows businesses to apply for marijuana consumption areas, only two cities (Denver and Colorado Springs) currently license such venues, with fewer than five between them; there are several private consumption-friendly clubs and event venues, though.

Some hotels and home rentals in Colorado ban smoking of any kind, but not all of them do, so check with your host or the listing agent.