Can an employer tell you not to smoke off of company property?

Question Details:

Tobacco use is not allowed on company property so some of use go off company property and park along the city street (which is allowed per city ordinance and PD) to have a smoke. We are allowed to go off the property for lunch. It was indicated to us that this looks unfavorable for us and we fear losing our jobs for something that has nothing to do with the employer. I feel whether it is done across the street or 5 miles away is legally the same. Important Notice