Fair enough. Let me re-phrase that: "it is generally accepted by public health organizations, and the law, that 'inhaling large amounts of these compounds over a long period of time can lead to serious disease.' It has yet to be conclusively shown that this is in fact the case, but the conservative position would be to consider them possibly dangerous to inhale in large quantities over a significant period of time. Better?
Even better would be identifying the quantity required to be possibly dangerous. Kind of like if you do not want excess radiation exposure don't live in a house built of brick. Higher levels than a wood house due to the small amounts of radioactive elements found in the rocks used to make bricks. Granted it's pretty low dose but it's still there. You can avoid even that little slight risk by moving, but you need to decide your own comfort level for that risk.