常用词汇：
relax oneself 放松自己
breathe fresh air 呼吸新鲜空气
energetic 精力充沛的
build our bodies 增强体质
do good to one’s health.对某人健康有好处
form the habit of getting up early 养成早起的习惯
take exercise 锻炼身体
keep fit 保持健康
oxygen 氧气
sleep disorder 睡眠不好
go on a diet 节食
green food 绿色食品
physical fitness 身体健康
lose weight 减肥
get rid of the bad habit of smoking 改掉抽烟的坏习惯
do harm to one’s health 对某人的健康有害处
give up smoking 戒烟
范文：
As we all know smoking does great harm to human beings. More and more people have come to realize how serious this problem is. But they are never bored with it. Some people think it is a kind of fashion, some think it is of great fun and others think that smoking can refresh them.
However, smoking does cause many illnesses. A lot of people always cough because of smoking. The most serious illness caused by smoking is lung cancer. Meanwhile smoking is a waste of money. Besides, careless smokers may cause dangerous fires.
It’s high time for smokers to give up smoking.
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