In Colorado, a new industry is taking a new root, Marijuana.
Starting today, the drug can be sold for recreational use to people over 21.
Each customer is limited to one ounce, which could cost up to $200.
Travelers from out of state can buy up to a quarter ounce.
In response to the new law, the Denver airport says you cannot carry marijuana through the airport.
If you do, you could face a fine of nearly $1,000.