Will second hand smoke from marijuana or crack cocaine effect a hair follicle drug test? How about if you have oral sex or kissing with a user but you don't use drugs, can their saliva pass drugs into your body that will show up in a hair follicle drug test?

second hand smoke will effect you, often you can get as high if not higher readings from second hand smoke. so yes if you are in a room with others smoking pot, you will fail the test just as easy as they do.