If he won't listen to you about quitting, then it's time to tell your parents or another adult to give him a lecture on it's dangers. Go on the web and download some pictures of what a smokers lungs look like! It's time you helped him have a reality check!
You can't stop someone unless they want to quit.
If he does not want to quit what can you do nothing. He must want to quit smoking
You can’t help somebody that doesn’t want to help them
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