The phrase "smoking habits" refers to the regular practice or custom of smoking, which involves inhaling and exhaling smoke from a burning substance such as tobacco. It can also refer to the behavioral patterns associated with smoking, including when, where, and how often an individual engages in this activity. Smoking habits may vary widely among individuals, ranging from occasional or social smokers who only smoke in certain situations or with specific people, to daily or heavy smokers who light up cigarettes regularly throughout the day.