The use of mobile phones in public places is as antisocial as smoking. Smoking is banned in certain places, so mobile phones should be banned in the same way. To what extent do you agree or disagree?

So, let's look at the two statements separately.

1) The use of mobile phones in public places is as antisocial as smoking.

This is clearly an opinion, not a fact. We can either agree with the view that the use of mobiles is as antisocial as smoking, or we can disagree. This gives us the perfect topic for our first main body paragraph.

2) Smoking is banned in certain places, so mobile phones should be banned in the same way.

This is also somebody's opinion, and you can choose to agree or disagree with it in your second main paragraph. Of course, what you write here will depend on the opinion that you gave in the first main paragraph.

Note:
- I don't recommend a "partly agree" answer for this question; it will be much easier to either agree or disagree (i.e. have a strong opinion).
- If the question contains two opinion statements, we can usually write a main paragraph about each one.

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