1. Bars and nightclubs: These places mainly provide drinks and entertainment. Because customers are mainly adults, they are more likely to become smoking places.

2. Coffee shops and teahouses: These places provide light food and drinks such as coffee and tea, so they become gathering places for some smokers and people who don't like smoking at home.

3. Barbecues and hot pot restaurants: Because charcoal fire or hot pot can mask the smell of smoking, these places are also more likely to become smoking places.