Mood Altering Plastic

I've recently been hearing more about the chemicals in plastics that that affect everything from cancer chance to mood. It makes me wonder, if we ever realize our folly about how we are living and our relationship to our evolutionary development, and get over our fossil-fuel addiction (hopefully forcing a heavy reduction in our use of plastics)...we may wake up one day and realize that some of our neurotic behavior was environmentally induced. What if half of what we think are psychological or personality problems are externally caused...I mean even if we know that someones hormones or neurotransmitters are off balance...we don't always know what caused those to get off balance. I'm really not trying to sound "hippy-ish" but as we reconsider how we treat our environment, we may also want to seriously rethink what conditions our bodies are historically/naturally adapted to and restructure society and our behaviors accordingly.