Is it just one drug test? if so you could potentially not smoke long enough to pass the test...but if it's going to be some random monthly thing or something it might be an issue. I don't know I haven't heard of that.......and i disagree with drug tests in general. Unless someone is acting all weird on the job or impaired I don't think its any of their employers business what they choose to put in their body. Not to mention there is a rather high false positive rate like one can show up positive for opiates from a poppy seed muffin.