SIR - I gave up smoking nearly 20 years ago and it is a stupid habit, financially and health wise but I do object to the way people like Andy Longman (T&A, June 15) lay it on about passive smoking.

I can imagine air filters will be bunged up each month but I ask are the ones above the bar, where smoking is not usually allowed, just as bad as those in the saloon and what are they all like after a couple of hours only?

After all customers do not spend a month in continuity in pubs, nor do they emulate filters by taking deep breaths to fill their lungs as they might do at the beach, say!

I wonder what a filter in a bus station would look like inside after a month.

Philip Bird, Nab Wood Terrace, Shipley