Am I as important as the children around me?Do we care about others more than we care about ourselve

Why, when children ask adult smokers for a cigarette or a light, the smoking adults reply that smoking is bad for you.
Watch this ad- it will get you thinking.
http://www.health24.com/Lifestyle/Stop-smoking/Multimedia/Is-this-the-best-anti-smoking-ad-ever-20140613