As has been stated here, not a documented sin.
Obviously we old people remember the 50's when all your neighbors, unsaved relatives, teachers, doctors...you name it....smoking was accepted everywhere! In the breakroom at work; in the office, I had office jobs in the 60's and co-workers smoked at their desk!!!!
Now when we look at the church, it's a commonsense thing. Bad habit, yes!
Unhealthy---yes! Sin...only as a waste of money.
I've known more than one person who was baptized, filled with the HG and continued to smoke; Still attended church faithfully, even played their guitar for worship ..(the pastor felt denying this would not be productive to this person's walk with God). Did they try to quit...yes...but for some it just was not an easy task.
This is a personal addiction and for many insurmountable. Be glad God is the judge!