Once you think about it taking into consideration how tobacco smoke causes mutations, what happens with the places where the smoke sticks to a surface? At first, if it includes chemical elements and then molecules it's possible to find mutagen material in there.
This was the subject of a 2013 study linking nitrosamines, present in tobacco smoke, and this source. That means potential danger for anyone that touches those surfaces and does not take the appropriate measures to avoid the eventual entry into the body.
Talking about Public Health doesn't converge very well with this kind of information and products like tobacco in the market, with even additives to make the addiction stronger. The electronic cigarette helps establish control over those substances, and at the same time provides a true alternative that allows to completely ban tobacco from being sold in public environments.
A great burden.