Even the Institute for Creation Research admits there's no possibility of a significant propose vapor canopy; in
SENSITIVITY STUDIES ON VAPOR CANOPY TEMPERATURE PROFILES Vardiman and Bousselot arbitrarily assume optimum values for a whole bunch of parameters such as albedo, and conclude that you might get as much as 2 meters of water into the atmosphere without knocking off everybody. Yet many creationists still push the vapor canopy, or even its more-ludicrous stepsibling the orbiting ice canopy. The gullibility is incredible.