What are the US laws concerning breaks and lunches?

The only Federal law governing breaks and lunches is a mention under the FLSA requiring that employees be paid for any break that is less than 20 minutes long. There is no Federal requirement that an employee be granted meals or lunches.

Some states have adopted laws and some, such as those in California, are rather complicated, but most states do not regulate this particular topic.

What state(s) are you working in?

Virgina has just pass a no smoking in public and working as a restaurant manager, I was wondering if I in violation if i denied my employees smoke breaks? Or am I required to give them a five minute break every four hours