I am convinced that switching from combustion to vaporizing has had a pronounced positive effect on my metabolism and has caused me to get leaner. I was already eating very nutritionally and exercising, but after stopping combustion, I noticed that I started to just lose weight without doing anything else differently, in fact, this was happening while I was getting lazy and doing less exercise.
I suspect that this is a combination of eliminating all the bad stuff from combustion and greatly increasing the intake of mediciinal content from the herb. It's possible that this also somehow accelerates all the other good habits I have (matcha tea every day, 72% dark chocolate daily, lots of veggies, etc.) similar to how a balanced diet provides combinatorial benefits.
I find myself hungrier throughout the day much more than prior to this change (not sure if this is munchies or metabolic), so I am snacking a bit more, but it has not caused any weight gain at all. I find myself craving protein more (beef jerky! peanut butter! NO, not together, silly). I lost a number of inches around my waste but not tons of pounds, so I know that my body has gotten a bit leaner and bodyfat % has decreased.
I find it difficult to believe such large noticeable changes was just a coincidence from switching my cannabis consumption method and not a direct effect. And I also now believe that Cannabis is meant for the body like vitamins, nutrients, minerals, proteins, etc...the chemistry of it makes sense to me although I am not a scientist.