Blow him up. Case closed.
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!
We can tell by your immaturity you aren't ready to be left alone or go somewhere alone. You're not an adult so get over it. Your parents are protecting you and doing what's right. Be thankful you have parents who care. Stop whining like a child.
You will thank your parents one day when you have your own kids for loving you!