You must have a state ID to purchase recreational products. For some products, you will need a state medical marijuana card. Tourists can use their state IDs, but must beware of taking cannabis outside of the state. A medical marijuana card gives you greater access to products and you can buy and transport more cannabis in one sale. You also become eligible for some tax exemptions. You must also be 21 or older to purchase UNLESS you have a medical marijuana card that authorizes you to purchase as a minor.