Recently I have noticed that you are addicted to smoking. Whenever you start smoking, the room is filled with a terrible smell. By no means should you go on with this addiction.

For one thing, smoking does great harm to you and your family, increasing the risk of cancer. In fact, second-hand smoker may suffer more than the smokers themselves. For another, smoking not only pollutes air, but also wastes money.

It is high time that you quitted smoking. To begin with, you should stay away from smoking triggers and always keep yourself busy. At the same time, you are supposed to develop more interests to distract yourself, but don’t expect to break the addiction right away. It is advisable to cut down on it gradually.

Quitting smoking is not as hard as you think. If you keep trying, you will succeed.

题目分析：书信是同学们比较熟悉的写作体裁，而且开头结尾已经给出，同学们只需用通顺的语言表述清所要求的要点即可。首先在文章开头要提出写信的目的，即劝Mike戒烟。根据提示信息，文章可以使用一般现在时，内容应该包括吸烟的危害和戒烟的方法两大主要内容。在列举危害和戒烟的方法时要注意使用表顺序的连接词，比如first 、second、third或者on the one hand 、on the other hand等，这样会使文章条理性更强。此外，在遣词造句上，应多用一些高级词汇和高级句型，如定语从句、倒装结构、非谓语动词等，以提高文章的档次。

【亮点说明】在文章第一段作者提出自己反对Mike吸烟，然后第二段讲述吸烟的危害，第三段介绍戒烟的方法，最后鼓励Mike，希望他戒烟成功。文章要点齐全，语言通顺，很好地完成了写作任务。for one thing，for another thing，to begin with，at the same time等短语的使用也使文章层次清晰，结构紧凑。此外，文中出现的固定句型it is high time that…..,条件状语从句If you keep trying, you will succeed.，倒装句By no means should you go on with this addiction.等也使文章亮点纷呈。