“Do constitutional rights end when one creates a business?”
As a matter of fact, YES they do. Many a FReeper helped to push such an agenda to eliminate private property rights for business owners. Search any smoking ban thread and you will see the convenient conservatives screaming for an elimination of private property rights for business owners.
They got it, now they can choke on it.
I've honestly never seen a vigorous challenge to smoking bans. I have seen vigorous challenges to religious freedoms; Hobby Lobby and Citizens United are pretty clear indications that your constitutional rights do not end when you purchase a business license.