Droves of pot tourists have flocked to Denver to sample its legal marijuana since Colorado became the first state in the country to allow recreational weed sales to adults. If you're thinking of joining the visitors heading to the "Mile High" city this year, here are a few things to keep in mind:

For a start, you must be aged 21 or older and be carrying a valid, government-issued photo card identification to prove it.

Residents with a Colorado state ID can buy up to an ounce (28 grams) of marijuana at a time, but as an out-of-state visitor you will be restricted to purchases of a quarter ounce.