Bringing any type of drug into or out of a country is illegal in most places, so don’t bring them with you when traveling (or at least make sure it’s legal first).
Driving under influence of drugs is also illegal in most places, and for good reason. Do not drive under influence to avoid any problems.
Many places do not allow the use of drugs in public, even when they are legalized for recreational use. Make sure it is legal before lighting a joint in a public place.
Nevada is known as being a state where residents tolerate most of the taboo activities, and they indeed tolerate marijuana as well.
The use of cannabis products in Nevada for medical purposes was made legal on November 2000, but qualified patients did not get a legal dispensary in the state till the middle of 2015, so they had to grow their own till then. A year later, in 2016, cannabis products were finally also legalized for recreational use, and Nevada became one of the states where the use of cannabis products is now completely legal.