my dad has been diagnosed with lung cancer. He has been suffering with shortness of breath and pain since December 
He is 65, smoker and previous drug and alcohol abuser.
He went for a biospy and had a heart attack after, he was placed in a medicated coma and he was fitted with a stent and released. 
He has had a small stroke since coming out in March.
How much longer will my dad be here, what can I do to make him comfortable and what can I expect?