Qiao is a sixth-grader at Yuhui Primary School. He is only 12 years old but has been smoking for three years. Liu, 15, is a Junior 2 student at Chicheng No 2 Middle School. He began smoking four years ago. "Smoking is part of my life," Liu said. Qiao and Liu are not those boys ' real names. But their problem, smoking, is a very real problem. In many countries, smoking is becoming a bigger proble m for young people. Most smokers start in their teens (years of  a person's age from 13 to 19) or earlier.