If a teenager buys into that image, then smoking begins. Adult aspirations - some teenagers believe that by smoking they are acting like an adult. If the teenager is raised in a community where all of the adults smoke, then this is perhaps a logical conclusion. These rational reasons are, by the way, many and powerful. On average, each minute of smoking reduces a person's life expectancy by a minute.
Smoking is addictive.
Once you get hooked it is very difficult to stop. Smoking is extremely expensive. Smoking has effects on personal hygiene. Cigarettes are messy and they make your hair, clothes and breath stink. These reasons make smoking look very stupid to any thinking adult.