Good points, I wasn't trying to imply that teenagers are completely blameless for their actions, just questioning the logic behind the situation. Sometimes philosophy fails where "Just Because" really is the better answer. :-)
All agree that the reduction of teen smoking is the goal, and a worthwhile goal. But when those that are engaging in the behaviour trying to be reduced face no punishment or consequences for engaging in the behaviour most attempts will be futile.
While another long stretch analogy, say the goal was to reduce teen speeding. Who should be ticketed and punished, the speeding teen, or the guy that sold them the car?