As a heavy smoker , he finds it hard to get rid of the habit, which has a bad on his health.
A. affect
B. effect
C. effort
D. affection
网友回答
A. affect
(答案→)B. effect
C. effort
D. affection
解析：A .affect动词：影响，感染，B. effect名词：影响，效果，C. effort名词：努力，D.affection名词：喜爱，句意：做为烟瘾很重的人，他发现很难戒掉这个习惯，这对他的健康有不好的影响。选B。