Just a couple of extra points..

[quote:357yw6ku]think that the question whether authorities should ban tobacco smoking in public places is [s:357yw6ku]the[/s:357yw6ku] one that is really topical and open for debate
[/quote:357yw6ku]

Compare:
This question is the one that is A. ie.This is the question that is A (as opposed to the other questions which aren't A.)
This question is one that is A. ie. This question is A/ This is one of the questions that are A.

In this case only people’s health will be successfully protected.
I think it's better to invert the subject and verb here
ie.In this case only will people’s health be successfully protected.

Otherwise (admittedly, in this particular sentence context makes the meaning clear, but still) it may sound like it is only people's health that will be successfully protected.

Similarly:
Only in this case does something happen. implies This is the only case in which something happens.
Only in this case something happens means 'But in this case (ie. as opposed to some other case) something happens.'

For more info http://www.bbc.co.uk/worldservice/learn ... tv34.shtml