The answer to your question is thyroid .
I believe this is a good question. Cause there are many people who are experiencing this. I believe that you would want to go slowly with the topic and not too fast cause you might get the person mad. Start off slow and try to understand why they smoke and why they chose to go with the group of people. Many people smoke due to stress, problems, etc. It makes them better knowing they can have drugs in their system. Although thats not the answer. Try to seek help for your friend or try to understand him and show him how you care and how his choices are affecting you
The answer to you're question is ... True.
Anything to do with your heart
