Table-top messages asking customers not to swear are being considered, as is the installation of swear boxes.
Tim Martin, the company's chairman, said: "We don't want to be holier than thou about his, but it is a fine balance for licensees. You want to let people have a good time and most swear a little these days, but the problem comes with proximity of groups.
"It can be unpleasant to sit next to a group of people swearing in a loud voice, but we do find that it can be the same people who swear a lot that then take offence."
Tim Rodgers, a JD Wetherspoon customer from south London, said: "They don't have music, and now they've taken away swearing. It was the only entertainment we had left."
The company has also opened a pub in Stansted Airport. The Windmill will serve both food and drink and it will be open from 5am until the last flight departs.
Wetherspoon plans to open ten more pubs by the end of July 2003, including one at Heathrow Airport's Terminal One in mid-June.