根据短文内容，用方框中所给单词的适当形式填空，每词限用一次。
The number of adults who smoke in the UK has fallen in recent years. Smoking among children, 小题1:, is increasing. More and more young people get to depend on cigarettes, just as adults do. Most of these young people here are 小题2: fourteen and sixteen. Smoking among teenagers is as popular now as it 小题3: 20 years ago. Cigarettes still 小题4: 120,000 people a year. And doctors say unless that changes, it will become one of the health 小题5: of the future.
