Can we institute blanket ban on smoking on company property?

Q. We run a carry-out/catering kitchen. Can we legally tell all our employees and customers that they can’t smoke on the property?

You may even be required to prohibit smoking. Pennsylvania has a ban on smoking in all enclosed workspaces, with few exceptions. Some counties and municipalities have their own ordinances. Even without this legal requirement, you are certainly permitted to prohibit smoking on your premises.