I had lunch with a friend from high school who I haven't seen since last year; he is a smoker and continues to smoke regularly everyday. I told him that cigarette smoking is very bad for your health, as I was trying to look out for him, but he didn't want to hear any of it and said that the cheeseburger I was eating at the time is just as bad for your health.
How do I convince him to quit smoking before it is too late?
To what extent is cigarette smoking bad for your heatlh?
I always thought it was extremely harmful to your lungs, but never did any research. Just believed what I was told. As I like to question everything, I am looking for concrete data showing that cigarettes are indeed bad for your health.