Cars are often a struggle, hope you've some decent leads. Are you, at least able to get to and from work?
It's tough to be the sober one, around someone who wants their whiskey. He sounds resigned to letting go, of course, there's no guarantees the end is as soon as the prognosis.
Has he tried ecigs, to compensate for the need for nicotine? It's not something, most choose to quit, just for others, that must have been evident that he smokes, when you became involved? The choice to quit is much more complex than waving health risks, withdrawal or anything. Much more complex. To compare to politics. ..like asking for second amendment rights revoked...seriously complicated. An ecig might meet a quasi compromise if coupled with the real thing.

Making an exit plan, sounds like it involves new living arrangements.

Hope all goes well, whatever your decision. ..