Given the fact that I have huge problems breathing when there is tobacco smoke (or most other kinds of smoke) in the air, yes I would find it ideal that people do not smoke in public. However, it would be really resource intensive to enforce it properly and thus I doubt that it will occur in the short term without undue use of police resources that would be better put to use combating other crimes in all likelihood. That said it is a nice thought to be able to go walking downtown without getting the occasional unintentional lungful of carcinogen infested air.