No. Water vapor is almost exclusively a feedback directly correlated with temperature change and not a climate forcing, except for very minor amounts in the stratosphere mostly resulting from oxidation of CH4. The difference between a forcing and a feedback is very fundamental. This is why water vapor is never included in the categorization of radiative climate forcings. The idea that increased water vapor emissions at the surface would have a “substantial” effect on global warming is ridiculous. What it would mainly do is produce more rain as the atmosphere sheds the excess.