Can you tell me, are cocaine users contagious to people around them?

Contagious????: You can't "catch" drug abuse or addiction. However, there is an old saying that "if you lie down with dogs, you rise up with fleas." if you are around people who are actively using drugs, this has a social influence on you, and may increase the likelihood of your ultimately using that drug. People who go to bars see people drinking, and they are more likely to drink.