How do you write a letter to your friend advising him to give up the habit of smoking ?

Address :

(Sender's address)

My dear friend,
On Sunday last I visited Kaushik's house and learn a lot about you. I'm very glad to know that you've stood first in the last terminal examination of your school . But at the same time I have become very anxious about your health . From Kaushik's I've come to know that you have recently picked up the very bad habit of smoking from some of your senior friends.  Havr you never seen the warning, 'Smoking is injurious to health '? Smoking is neither good for the smoker nor for his family . It affects mouth, nose and other respiratory  organs of the smoker. Smokers are very often seen to suffer from bronchial asthma and this sometimes turns into cancer, a fatal disease. Smoking is also causes growth of tumour and increases blood pressure.  All these lead nurture such a bad and dangerous habit.
With love,

Your sincerely, 

Arun

(Receiver's address )