This story really touched me. I'm old and smoked heavily for many years. I know the feeling of helplessness and hopelessness. Us older folks don't get around as much, especially if she doesn't have the internet.
So, I saw this from her point of view. You are a wonderful daughter! If a relative hadn't done the research for me, I probably never would have tried it myself. I am forever grateful to my brother for changing my life, as I'm sure your mother is to you.