Here we go... Your viewer has respiratory deficiency... And he's put under some oxygen mask... But you know better what's good for him... You've talked to his wife. She's a non smoker. And you've noticed that, when you visit this man's room, right after you had taken a smoke break, the smell of your smoke still very strong, you were able to see that sort of bulge under the sheets of his bed... No need to tell you more: what this man needs is... smoke... His body is craving smoke so much that that lack of smoke induces a respiratory deficiency... And as a very conscious nurse, you are going to help him...