I don't think you should be very concerned about this. Your body adapts very rapidly to nicotine. Of course, after you smoke a cigarette, you might have a very temporary acceleration of your heart rate, but it comes back to its usual rate. It doesn't have any long-term effects.
I'm not promoting the advertisement of nicotine or any nicotine-delivery device. I agree that nicotine in any form should not be available to people under the age of 18. I quite agree with that, but I don't think we should exaggerate the harmful effects of nicotine, except that it's addictive.
Mind you, the smokers smoke.... There's no better way to control your mood than to have a cigarette. What were they giving to the soldiers at the front during the war? They were not giving them chocolate; they were giving them cigarettes.