Heard that perfumes contain toxic chemicals capable of remaining in the brain for decades once crossed the blood brain barrier, is this true?

I don't think so: Our world's full of causes, and an understandable fear of "chemicals" has prompted some people to demand a "perfume-free workplace." i don't want to get into any arguments here, but i think most healthtap members will tell you these fears are not evidence-based. The most inflammatory claim about neurotoxicity is a non-peer-reviewed poster. I'll add that i very much dislike artificial fragrances.