UMASS employee with medical card?

I will be doing my externship at UMASS hospital to finish my CMA certification. I am a medical smoker that smokes a very small amount. I read that if you test positive they put you through a interview to see if you are responsible enough to work there as a smoker but I also read they can still deny you because it is not legal on a federal level. Does anyone work at UMASS in worcester and also have their medical card?

Thank you :)