I agree with mickey - that is nonsense.
That is also nonsense.
======================== A tech for our gas utility had a dog that partly opened a stove gas valve. Strong mercaptan smell and gas present. House was aired out and mercaptan smell lasted. He had good utility gas detection equipment and the gas was gone. Mercaptan can absorb or adsorb on surfaces and stay around after the gas is gone.
======================== If a man says something and no woman is present is he still wrong?