DeepFried they're talking about pot smoke not pot vapor. Besides, you're wrong, look anywhere or ask anyone who knows what they're talking about and they'll tell you, holding your hits for more than 5-10 seconds is just pointless, as all the thc that will be absorbed has been already. If you really need "sources" then fine, ill find you plenty, but don't argue a point if you don't know what you're talking about, it's better to be thought an idiot than to open your mouth and remove all doubt.