Clayton's smoking ban

• Prohibits smoking in all enclosed public places, with several exceptions. They include outdoor dining areas, private residences, tobacco shops, 20 percent of hotel rooms, and private clubs.

• Violations carry a fine of not more than $1,000 or incarceration of 90 days or less.

Other smoking bans

• Kirkwood's took effect Jan. 2. The ban prohibits smoking in bars altogether.

• St. Louis and St. Louis County bans take effect on Jan. 2. The county ban exempts bars that derive 25 percent or less of their income from food or other nonliquor items. The city ban exempts for five years bars that admit only people at least 21 years old and have no more than 2,000 square feet, excluding kitchens, storage areas and bathrooms. Both the city and county bans exempt casino gaming floors.

• Lake Saint Louis' ban takes effect Oct. 1.

• Arnold and Ballwin established smoking bans several years ago.

• Illinois went smoke-free on Jan. 1, 2008.