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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, 1 , is increasing. More and more young people get to depend on cigarettes, just as adults do. Most of these young people here are 2 fourteen and sixteen. Smoking among teenagers is as popular now as it 3 20 years ago. Cigarettes still 4 120,000 people a year. And doctors say unless that changes, it will become one of the health 5 of the future.