It is possible to be mildly allergic to many things. However there is a tipping point after exposure to maybe just one more chemical,etc..A toxic overload and then the severe reactions start..

It took me about 40 yrs to develop Multiple Chemical Sensitivity. Workplace exposure as a Printing Press Operator in the 80's was probably the worst.

Today, I get neurological M.S. like symptoms, from Fabric Softener and every other common chemical based household and personal care products.
[link to en.wikipedia.org (secure)] toxins settled in my brain and wrecked havoc on my brain barrier..

Pharmaceutical products, medications,etc..10 yrs of tests and treatments for a Panic disorder(full body panic when exposed to chemicals while in public places) and for the MS like symptoms before I figured it out..

Folks pay a lot of money for these products, not me..why would I pay to be poisoned..I'd rather have a life chemical free.