I don't know what rigs you have been on, but many drillers and tool men won't put up with that **** one bit. If you find a driller or tool man that is a user, move on to another rig, the number of doped up roughnecks are a lot lower than 90%. Especially on company owned rigs.
Drug use is extremely common on all drill rigs. They have to run drug tests every week, and these guys find ways to skirt the tests. Certain drugs, like "bath salts" don't even have a test yet. These guys are very good at hiding it. I personally know the drug policy enforcer for a drill company, it is a constant battle.
Do you remember the Rig Manager that jumped off a 6-story drill platform a couple years ago? He was making 160K overseeing the operation and was cracked out on bath salts. That was here in Oklahoma on a company rig. This guy was in charge of the rig and doped up. It is rampant problem.