Suppose you are Roktim. E-mail your friend Abid not to indulge in smoking.

(Informal E-mail)

To: abid@gmail.com
Cc:
Bcc:
Subject: Make sure you never start smoking
Hi Abid,
How're you? I'm fine.
I'm going to discuss about a critical problem of Bangladeshi young generation. You shall find boys of our age getting into the habit of smoking nowadays. It's injurious to health. It can create various types of dangerous diseases. But, unfortunately our people are not conscious about that. Since you're a very intelligent guy, I hope you will never form this bad habit. If you can, please try to make others aware of the dangers of smoking.
Have a nice time.
Yours ever,
Roktim