同学你好，该知识点来自沪江网校《雅思语法精讲【随到随学班】》的课程，想要更系统的学习，欢迎进入课程学习。不仅可以和更多的同学一起学习，而且还有老师、助教随时的学习指导和知识点解答哦。

同学你好~
After the writer read an article about 'smoking and your health', he smoked the last cigarette.
错误：your health人称错误，引号多余
修改：After reading an article about smoking and health, the writer smoked his last cigarette.

Then,he didn't smoke for a week.
错误：then后缺少空格
修改：Then he didn't smoke for a week.

His wife suffered terribly, because of her husband's bad temper and large appetite.
错误：逗号多余
修改：His wife suffered terribly because of his bad temper and large appetite.

Whenever, friends often offered him cigarettes and amused him,because he always produced a packet of sweets.
错误：Whenever误用为句首词，逗号空格缺失
修改：His friends offered him cigarettes and amused him by producing sweets.

However,at a party, he accepted a cigarette from his friend.
错误：however后缺少空格
修改：However, at a party he accepted a friend's cigarette.

祝同学学习进步~