To get rid of a bad habit, it is important that we first know how harmful this habit is. Take the habit of smoking as an example. Obviously, smoking is harmful to health. It can lead to lung cancer and heart disease. Besides, smoking wastes money. A heavy smoker spends almost as much money every day as he eats himself. So if he can realize the danger and waste, it is likely that he will quit smoking at once. To get rid of bad habits, we must also have strong will. Let's take the habit of smoking as an example again. Many smokers relapse soon after quitting smoking. Many of them can't tell how many times they tried to quit smoking and how many times they failed. Therefore, if we constantly change our minds, it is impossible to get rid of any bad habits.