going on a tangent here, there are those that believe the psak that is assur only if you smoke for a lengthly amount of time, where the dangers are absolute. stopping after a short while, is inconclusive to cause major harm to the smoker, although you can become addicted and continue to smoke an entire lifetime it is within reach to stop therefore only when the smoker decides to smoke all his life or actually smokes to the point where it in conclusive to cause major hard to the body that is when you are being oiver.
i have said my opinion, im not here on a marathon, this is the basic idea for more info stop the next yeshiva guy that you see smoking (make sure he’s a mature one or don’t bother)