I don't think it matters that he "could have left", it's that this law was suppose to be in full enforcement LAST MONTH, every public establishment is suppose to have clearly legible signs that state that they are a non-smoking establishment. BW3's was clearly breaking the law and should be penalized for it. He clearly requested for the smokers to put out their cigarettes, and the manager should have enforced the law. The OP was trying to have a nice dinner with his family, but he ended up having a not-so-nice trip to the ER. BW3's is clearly in the wrong, they broke the law, he has the right to sue, but I would call that number and an attorney to see if he has a case.