Not a scientific answer, but because they are immature.
Optic nerve is the most affected as it results in total blindness
Answer:
I believe that the method that is the most effective way to quit smoking is to use a nicotine patch. What the nicotine patch does is reduce the amount of nicotine entering your body. Gradually, you decrease the amounts you are taking each day until you finally get rid of the nicotine entirely. The nicotine patch still gives you the effects of nicotine, but without the negative effects of smoking
