<human>: Can you provide a brief rundown of the text in within 3 sentences?

A bit of background: I don't smoke, but I was parked in the lot at a convenience store across the street from a hospital that specializes in cancer treatment. 

I was looking at some notes from work and not paying attention when I heard a voice say "hey buddy, can you do me a favor?". 
I looked around and didn't see anything and assumed it wasn't directed at me, and just as I was about to return to my paperwork I heard him again. Over my shoulder and next to my car was a frail old man in a hospital gown sitting in a wheel chair. He was wearing an adult diaper from the looks of it and had tubes coming out from his side, and had wheeled himself out of the ward, across the street, and settled at the curb in front of the store. Because it didn't have wheelchair access he had no way of getting inside himself, and so he asked me if I'd go in and buy him a pack of cigarettes.

Being that I'm not going to be rude to a man who seemed to be knocking at death's door I took his money, got him his smokes, and even asked if he needed a light (which he didn't). Before going in I asked him if he was sure he wanted me to, and he seemed very adamant about lighting up.
Immediately afterward I felt really strange and conflicted. 

Reddit, specifically the smokers, was it wrong of me to buy him a pack and throw gasoline on a blazing fire, or is there something to be said for giving a (seemingly) dying man a taste of his vice? Would the average smoker think this was a good move?
<bot>: Bought a sickly old man some cigarettes because he wasn't able to buy them himself. Wonder if I'm operating in a moral grey area or an out and out dick.