英语作文 smoking is harmful to our health.Please write a letter to your father,tring to persuadehim to give up smoking.(60字）

dear dad,
I'm writing to tell you not to smoke any longer.
As we all know ,smoking is harmful to our health. According to medical survey,smoking too much will cause lung cancer 【肺癌】.Besides, when you are smoking ,the smoke will affect people around you.For example,mother and i may get cough. IN a word ,smoking is harmful to both you and your family.In order to build a cleaner and healthier environment for us to live ,i hope you can give up smoking.
love you
your son