There is no flaw in the logic, YJ. The difference between smoking and drinking is that drinking in moderation doesn’t hurt you (some say that a drink a day may be even good for you). Smoking is harmful from the first puff of the first cigarette; the damage to lungs begins right away.
It is particularly harmful to convey the message to teenagers that smoking is cool (and that is the message they conveyed to the teenagers, perhaps unwittingly).
I imagine you rank as one of the most boring persons on the face of the earth.