How can I help my father stop smoking?

My father has been smoking for nearly 12years. And it will leads to bad health. I hope to help him stop smoking. But it seems too difficult...can you give me some suggestion?thx

Have you been to China?

which city have you been visited and what's your feeling? i'm curious about that.Thanks.

When will you like a cup of coffee？

do you like to have a cup of coffee when you are reading a book,thinking about something and feeling boring?

Have You Been to China?

which city did you visit? what do you feel about it?