Essential oils are very, very concentrated. Most are not safe to touch to human skin, let alone breathe. If you want your house to smell like, for instance, mint, try putting a few mint leaves in hot water. Don't leave it simmering, either, just let the mint disperse in to the water, and a little waft around in the steam, before drinking it. At least, that's how we do here. No point poisoning your birds!