I worked for a few spray-foam insulation companies in my early 20’s. I’m just waiting to hear the same thing from spray foam. Half the guys I worked with didn’t wear masks most of the time and were just covered in foam all day breathing in the off gassing of fire retardents and blowing agents and other nasty chemicals. I quit because I saw the writing on the wall and my boss hated me for quitting before training my replacement. I told him it wasn’t worth my health.