Everyone knows that, if you're planning to smoke weed, you don't want to let it dry out. Dry weeds burns much too fast and doesn't roll well in joints. But what about vaping it? My hypothesis is that the weed has to be dry before it gets hot enough to make vapors. Water boils - turns to vapor - at 100ºC. In the process of boiling off, it takes the heat energy with it. Nothing gets above 100ºC until all of the water is gone. THC turns to vapor at 200ºC. My perception is that the first hit is very fresh and tasty, but not as strong as the second or even the third. I think a good part of the heat energy going into the first hit is spent boiling off the water. So - if there's any truth to this hypothesis, how to test it? Two samples from the same bud, one kept in it's hermetically sealed environment and the other left in a warm, dry place for a day. On succeeding nights take two hits off of one or the other and record perceptions. That's really too subjective for good science, but without $50,000 of lab equipment, the best instrument I've got to analyze the potency of the hits is me. And I'm willing to make the sacrifice, for the Good of All Mankind, nay, for the Good of All Sentient Beings! Go Science!