The only legal way to consume cannabis in Las Vegas is in the privacy of your own home. Nevada still prohibits consumption in public places, and unfortunately public consumption lounges have not yet been legalized. Medical marijuana patients in Las Vegas can possess up to 2.5 ounces and grow up to 12 plants if they live more than 25 miles from a dispensary. One of the most important things to know is that adults are limited to possessing no more than 1 ounce of cannabis flower and have the option to grow six plants, only if they live more than 25 miles from a dispensary. What to know about dispensaries in Las Vegas, NVīefore you head into a Vegas dispensary, make sure you take the time to understand Nevada’s marijuana laws.