I've always wondered why someone would do drugs while they were looking for work. I mean, there's the obvious reason; the job you accept may well require a piss test, and you don't want to fail. But beyond that, if you're looking for a job, it's a fair bet to say you don't have much disposable income. If you don't have money, you shouldn't be doing drugs. You're either spending the money you don't have on drugs, which is stupid, or bumming drugs off friends, which is obnoxious. That and if you're totally fucked up all the time, you're not going to be terribly motivated to find work, nor are you going to do all that well in an interview.
I'm not saying drugs are bad, but you probably shouldn't be doing them while looking for work.