结论：环境性吸烟暴露与多发性硬化的患病风险增加相关。
Conclusions: Exposure to environmental tobacco smoke is associated with an increased risk for multiple sclerosis.
结果11项家庭环境因素对青少年的吸烟行为均有影响，特别是家庭成员中兄弟姐妹吸烟、父母吸烟和青少年对父母的依从性是重要的影响因素。
Results 11 items of family conditions contributed to smoking behaviour of secondary students, especially brother and sister smoking, parent smoking and students 'compliance to their parents.
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