Automobiles are not addictive in the medical sense, but consider that, all else being equal, heavy car users will, much faster than others, lose the capacity to walk long distances.
I suspect (I'm a non-obese non-smoker) that far more obese non-smokers get winded by walking such a distance than non-obese smokers, at least until they're fairly old. Also, in walkable cities, I see quite a few smokers but much fewer obese people. If we're talking about hiking hills, it balances out a bit more, although I think the obese would still be at a disadvantage. Losing some of your lung capacity doesn't matter too much until you do intense exercise, but obese people always have to expend extra effort to carry their weight around.
I take transit and cycle everywhere. Even with the bike and bus there's lots of walking to and from bus stops.
When I am out with colleagues and we want to go somewhere even a half a mile away people are all "that's soooo far..."
No wonder e-scooters are so popular. (And I suspect lots of their user base are smokers.)