CONCLUSION: The effect of smoking seems to be suppressed by the environmental mutagens in Beijing as well as by the elevated level of natural radiation in HBRA.

• 结论: 外周血淋巴细胞染色体易位的吸烟效应似乎被北京地区的环境诱变因素或高本底地区高出对照地区的天然辐射所抑制。