I would say about the best solution would be the range hood. It would not exhaust so much air, that I would worry to much about a fresh air intake. Any exhaust system, the more air flow, the more fresh air needed. OP being in Wisconsin I would guess he is talking about for winter use. If your heating source has a vent to the outside, that will be your fresh air intake. Your garage would have to have some really big air leaks, to not intake the air from the furnace vent. As long as the heat is not on, not a problem. If the heat is on, you may have issues.
I thought my garage leaked plenty. I put in an exhaust fan. Its an attic fan, with outside louvers, just in the wall. With my overhead door shut, my service door will open about half way on its own, when I turn the fan on. I never, ever use it with out haveing a door open. Does not matter the weather or the temp outside, it never is on without the door ajar.
I plugged in a CO detector, to passify the wife. It just went off all the time, so I unplugged it.
As far as the smoking goes its your garage, you do as want to. I smoke and I think there are many more rude non smokers than there are smokers. In an outdoor arena, I do not think my smoking is bothering the one person that walks from two sections over to tell me about it. I would also say that if you can not go out to eat, or a movie, etc, with out wondering outside to smoke, you have a problem. I have encountered way more non smokers that are more concernered about smokers that are out of the way, off to the side, watching where their smoke goes and where they put their butts, than smokers that are out in the open puffing away in the middle of a crowded place.
As far as cancer. If you can pour it or spray it, it causes cancer. If you eat it or wear it, it was probly treated with something that causes cancer.
Its about lunch time. I think I will go get some triple cheeseburgers, some chili fries, and a soda, followed up by a 7 layer cake and ice cream. When I get home I will spray the yard for weeds and fertilize. My boat trailer need the wheels painted, and bearings packed. I will ponder what my smoking is doing for my health all afternoon.