One thing to do is march down the center of the road
vaping/smoking since that is the only place you will be allowed to do it in a downtown setting. I haven't heard of IL cops busting anyone for doing that as a protest to our 15 foot rule.
I saw a comment that the only problem is including cigarettes. No, the bigger problem than including e-cigs is proclaiming private businesses as public. If they can do this your house (and/or car) will be next just like in CA.