Yeah relic sites are amazing , and i ' m currently waiting for an email verification hiccup to be sorted so I can sub and get that sweet covert cloak , and I find the easiest way to avoid gatecamps is to use the map to avoid people XD that and Dscan saved my skin twice today . 20 hours in and only the tutorial death on me , then again all i ' ve really done is explore . <| sep |> the total amount of vapor would be diluted , all else being equal . But all else is not equal because , well , physics and physiology . Sure , if you collect and measure the vapour on exhalation , you ' ll have mixing of the 10 % room air , but while you ' re holding your breath , the business end of your lung is full of undiluted vapour . You inhale full strength vapour at first , filling the 90 % of the respiratory system capable of absorbing it , then you top up with room air which fills the dead space if you use the scheme I described . Dilution requires complete mixing between the dead space and the active absorption space . Molecules of vapour move randomly on a microscopic scale , so diffusion turns out not to be relevant over the time scale of your toking . As I said , read up on how the dead space is measured happy to continue the discussion if you care .