I hate to bring this up, but this is a nonsmoking zone.
对不起提醒一下,这儿是禁烟区。
You'll get used to is soon.
你会慢慢习惯的。
Second, if your friends have problems, do not give advice. Ask questions instead, such as What do yo want? How do you feel about it? What are you afraid might happen? They will be able to find answers to any problems themselves, with your support. They