There are studies that relate pheromone exposures to changes in hormones production (for example Androstenone-Testosterone). Although I don’t know if these changes are significantly harmfull, specially taking in count we only breathe them…
Pheraoh, read this post that discuss the same.
Long term health effects of pheromones? - #3 by tacitus
Anyway it would be interesting to know if there are some recent discoveries in this topic. Anybody?