Please provide scientific support for this statement: "Smelling a chemical doesn’t necessarily mean that your health will be compromised (think perfumes)." Hahaha! Perfumes are made from petrochemicals and they have trade secrets. Read "Scent of Danger" http://www.scientificamerican.com/article.cfm?id=toxic-perfumes-and-colognes
“All things are poison, and nothing is without poison; only the dose permits something not to be poisonous.” Paracelsus (1493-1541)
While toxicology has evolved into a complex discipline, to answer that question, it is important to understand its basic concepts. Only then can we better understand how decisions based in toxicology are used to protect populations from the harmful effects of chemicals.
For one: Toxicity is the relative ability of a substance to cause harm to a living organism.
The “relative ability” depends not only on dose (concentration) but also depends on route of entry (inhalation, oral, dermal etc.), duration of exposure (one hour, three days straight, thirty years), frequency of exposure(night time, all day etc.), intra-population differences, among others.