Totally, completely fine. You won't test positive. It really all depends on body weight and type, and how often you smoke. I've had skinny friends test negative after just a couple of days. In any case, even if you're a hardcore everyday smoker, and fat to boot, you could theoretically test positive depending on the test used up to like 2-4 weeks after your last use.

But yeah, you're completely fine, no worries. Good luck with your new job