Children are pretty stupid that's why they have parents to guide them. If you're lucky you have good parents who won't allow you to form bad habits of any kind, if you're not lucky......you smoke.
You grow up and you have brains now of an adult, your choice to quit smoking, or not.
Why does every bad thing a person does in their life have to be blamed on some thing or some one other than on the person who is doing it?
At some point you have to take responsibility and claim your actions as your own.
Now if someone was tying you up and cramming ciggies in your mouth and making you smoke 'em, different story.