As of July 1, 2017 recreational or adult-use is available to select dispensaries near the Las Vegas Strip and surrounding areas

How to Buy Cannabis in a Recreational State

Nevada as a whole is also a medical reciprocity state, which means you would be able to purchase from a medical dispensary facility as well if you have a medical recommendation from another US state. 

Please note, that regardless of medical and recreational regulations, it remains a private use only area and consumption in public, in a vehicle, or on federal land is strictly prohibited.