This will probably make more sense if I give some background first. I started smoking weed again last week now that it is legal in my state, but I was weed free for about 10-12 years due to working for companies that made peeing in a cup a requirement. I am a major lightweight now as a result. I can load a piece of bud about the size of a small raisin into a pipe and get a nice high that lasts several hours. Yesterday I got my first vaporizer and took it for a test spin. I loaded up my normal raisin sized piece and followed the instructions for my vaporizer. My first few hits i could taste the bud but when I exhaled I couldn't see anything. I opened it up and found that the weed was brown on the bottom but mostly green so I crumbled it up and tried three more hits. On the first 2 hits I tasted the bud but again there was nothing visible on the exhale. The third hit I let it heat longer and took a much longer draw, This time I actually coughed and the exhale looked like what I get from a solid pipe hit. When I looked at the pot afterward it was mostly brown, but had a fair amount of blackening which is making me think it had started to burn instead of just vaporizing. At this point I was also thinking the one visible exhalation was my only good hit, so I crumbled and loaded up a second raisin size piece. This one I went back to following the instructions for my vaporizer and drew slowly, holding for 5-10 seconds after each draw and was back to no visible vapor on any exhalations, though I could taste the weed on each hit. After about 5 hits the weed was brown with almost no blackening. At this point I realized I was pretty high. A few minutes after that I realized I was a lot higher than I intended to be. This brings me to my questions. Is it normal when vaping to not exhale anything visible? Is the smoke that I exhaled on the one hit just an indicator that I actually burned my bud instead of just vaping it on that hit? Is it possible that I only got the one good hit and got way more baked from that 1 vape hit than I do from a comparable pipe hit? Were all of my invisible hits "good hits" and I just overdid it because I wasn't getting the visual cues I normally use to to measure how much I have ingested?