In the roughly two months since most Tokyo taxis adopted a no-smoking policy, there has been little trouble among passengers, while an increasing number of drivers are thinking of quitting the habit themselves, a recent survey found.

"The biggest fear (among taxi drivers) was that the ban would cause trouble with passengers. . . . But enforcement does not seem to be a problem," Johnson & Johnson K.K. Consumer Co., which conducted the poll, said in a statement released late last month.

The firm distributed questionnaires before and after the ban went into effect on Jan. 7 to the capital's 3,396 taxi drivers. They received valid responses from 1,664.