I'm pretty allergic to all those things so I'm going to disagree with your implied preference and take the haribo and brake pad dust all day.

Would the world be a better place if we had brake pad dust flavored candies? I like to believe so.

There weren't many North American conifers on the African savannah when humans were evolving, and our ancestors' reproductive success was not generally affected by air quality. We haven't evolved immunity to things like volcanic gasses which have been around forever. Many plants deliberately evolved to produce toxins. A few of these we find delicious specifically because we did not co-evolve with those plants. Natural = safe is a bad heuristic.