在这些吸烟者中，ALS危险性随着开始吸烟的年龄递减而递增。
Among those who smoked, the risk of ALS increased as the age they started smoking decreased.
研究人员询问病人吸烟的状况，如：是否吸烟或者以前曾经吸烟，开始吸烟的年龄，每天吸烟的数量，如果以前曾吸烟，那么在多大年龄戒烟了。
Current or former smokers were asked the age at which they started smoking and the number of cigarettes smoked a day.
结果（1）开始吸烟者年龄主要集中在15～25岁，占总调查人数的72.00%；
RESULT 1)72.00% of the smokers began to smoking when they were 15 ~ 25years old.
结果（1）开始吸烟者年龄主要集中在15～25岁，占总调查人数的72.00%；
RESULT 1)72.00% of the smokers began to smoking when they were 15 ~ 25years old.
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