I'd love comprehensive labeling requirements like this. It always makes me deeply suspicious whenever such requirements are opposed. See for example the recent controversy over labeling GMO food. The resistance against that was insane.

However, labeling doesn't really help people exposed to second-hand whatnot. The smoker/vaper(/perfume-wearer) may find the ingredients to be acceptable, but what about all the people around them? And unfortunately, smokers are not the most considerate bunch.