What is the argument that smoking is sin? / What Bible verses are used to infer that smoking is sin?
There are multiple reasons why smoking can be seen as a sin. And some of the reasons appeared because we only started to learn some things about smoking in the last hundred years.
Smoking is proven to be unhealthy, thus when smoking you are willingly destroying your body
Nicotine and the habit of smoking is addicting just like gambling or alcohol. And addiction can be seen as a devil you need to resist or a temptation to be avoiding. Also an addiction overpowers you and becomes your master.
Some people are trying to look cool and conform to their smoking environment.
But the first point is the most suggested when talking about smoking being a sin.
Is smoking a sin just because it is injurious to health? If so, it would be a sin to keep on eating fats when the doctor says not to and you can't resist it.
This actually a general social issue which is invisibly linked to it being a sin or not.
People say to each other all the time, even to strangers: "Smoking is bad for you!, Stop smoking!"
This is social acceptable, but ask yourself if you see a fat man it is social acceptable to say to him:
"Stop eating, so much, it's unhealthy!"
Well, no. Not yet.
The same reason why it's social acceptable to call someone out on their smoking, is the reason we can call someone out using the bible as a weapon against an unhealthy habit smoking which can be seen a sin.
Because many Christian parent's don't want their kids to smoke it's easy to grab the bible and call it a sin. because it's unhealthy. But it wouldn't be very social acceptable to grab the same bible and call someone out because he's fat.
The spirit of time changes a lot, the German's have a word for this zeitgeist.
Somewhere in the future you will probably see this happening.