Only trouble I can see it causing is with your pre-employment drug testing. That and if they have random tests. But once you have your job and you're not getting tested, it shouldn't effect yout job at all. If you're one of the types that can't keep thier shit together, then you may have a problem. I can keep a job and advance in it and smoke every day. Some people can't manage it. It's not that hard though. Just get your priorities strait.