how to quit smoking

I am a non-smoker but I know some smokers who quit smoking successfully. One is my friend. He downloaded apps to help him stop smoking. But actually I think it depends on your determination. My dad smoked a lot for a long time in the past and he quit smoking secretly. He announced it when he did it. At that time when he felt like smoking, he would go to do the homework such as mopping the floor. So he would not focus and think about smoking so much. He had kept on doing it for a week and he didn't have a strong need to smoke. After a month, he didn't feel like smoking any more. I hope their experience can be helpful for you to get rid of smoking. Good luck!