This would have been a late 50s, early 60s story in a pulp such as Galaxy or Worlds of If.
A research team is trying to locate the vector for a lethal plague which is sweeping the world. They are, as I recall, in a sealed lab with a waldo-equipped autopsy room for dissection of cadavers.
Despite their best efforts at isolation, one of the team (a pretty young woman, of course) comes down with the plague. Her superior eventually realizes that the plague does not affect smokers, and she's the only one on the team who doesn't smoke. The day is saved, humanity gets the cure, and the scientist gets the girl.
So, what's the story?