At the end of the day you have to go by the POH.
But simply put it ill say it like this.
Man goes to the dr , ive got this cough, mmm dr says xray for you come back and see me next week. Comes back , well sir ive got some bad news sorry you have cancer, Oh he says. Dr do you smoke, yes he says a pack a day. Oh but that cant have caused it, Oh why is that the dr asks, Cause the smoke companies says it doesn't and its not proven.
Guess you could call me a Dr lol