There is two sided to the stop smoking issue. Usually those who smoke will stop when they are ready and preaching to them will not change them. However, there is something that will promote health in smokers. This ironically will potentially help them quit all together.
It is posted under lungs after smoking. There is a lot of information on the web on how boosting your glutathione will help with cancer prevention.
Think about it, prevent cancer, help loved ones stop smoking. It is a win win situation.