How to get someone to realize they need to stop smoking?

I have read the statistics of smoking cigarettes, but realize that people who smoke have to quit on their own.

My friend is about to become a dad and am worried about his health and how it will effect the baby, even though he smokes outside, away from everybody around him. He’s tried to quit but can’t. I know it is difficult but how can I get him to realize that he should stop smoking?

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