I am assuming your talking about a pre-cooked ham.
you won't want to smoked it too much being there already smoked.
also if it's hickory smoked you might want to keep that in mind when choosing wood types.
Any pork rub should do. You can search the forum rub recipies.
Is it worth it? That's a hard call. They are pretty good.
Their not as good as home cured ham wich is a whole different story.
My advice is give a shot and see what happens. It you don't go hungry, Then it's a success.
DeejayDebi pretty well coverd the cokking time and temps.
Since they are pre cooked you can go as low 150 but 160-170 is the basic rule of thumb.