I think allergic reactions that make you aware of issues is a good thing. What I'm really afraid of are cumulative toxins that aren't excreted which show up as cancer or other diseases later. I have 2 photo professors that died at a young age. It's rumored that both have died from years of chemical exposure. One died from ALS and another died from brain cancer. I don't live in fear, but I'm not foolish with chemicals either.