So now we have to figure out how much actual water vapor is lost through combustion. As a control, I think we could take a tin of tobacco and measure out three identical portions in weight and relative mass. These identical portions would then be adjusted as such: 1. Weight from the tin (no moisture loss). 2. Weight after oven drying (to no apparent moisture). 3. Weight after an "average" drying time. We then weigh the test pipe and make sure it is exactly the same weight without the tobaccos before weighing and smoking the three portions. We document the results then create an algorithm adjusting for water vapor. But, this won't tell us how much water vapor is in the smoke! Damn! Science is HARD!!