What kind of research can be used to promote a public area smoking ban in my city?

Hi,
I am doing a persuasive speech for my Public Speaking class with the statement of Policy: Smoking should be banned from outside of restaurants, at bus stops, and around playgrounds.

I have already done research and outlined the effects of second hand smoke for the first part of the speech which covers what the problem is. I now need to talk about my solution which is my statement of policy above. But I am not sure where to go from here, what kind of information I should research for this.

Any help would be appreciated.