Doctors should take the patients desire to kill themselves into account. Doctors consider a patients health, age, habits (smoking), and many other factors when they decide who gets a organ and make a list of who has priority. Trying to kill yourself should really drop you on the organ list.
You dont want to waste a lung on a chain smoker when someone else needs it just as much and wont do any harm to their new lung, I see no difference between this and a person who is suicidal.







