I ask this because I notice that since I changed my routine of thick vapor or smoke with my tools and joints(if I have to when not home) to using very little and just adding more in increments to keep the flavor as I slowly raise the temperature to absorb as much as possible or toking on a joint VERY LIGHTLY and inhaling fresh air deeply after the light puff that the high I get lasts long and has no ceiling meaning I can go on and on until I'm too high BUT I don't experience any negative effects but that can be because I eat before and sometimes during a session. I think the reason why tolerance and usage goes up which contributes to a ceiling high, is because we are so use to inhaling thick vapor that our body treats it as something that is an invasion, for the most part and doesn't utilize most of it and the only time we get that bang upside your head, psychadelic high is during our first session of the day when the body is relaxed and not flooded all at once with smoke or vapor or using something different then we are used to but after that we can only get so high due to thick vapor causing a fight or flight reaction which means we will never get to experience the ultra psychadelic high that cannabis can give when you are relaxed and taking in a lot of oxygen to help it metabolize the concentrated cannabinoids. I think this is why eating cannabis can get you into that ultra strong high which is because it is digested much slower and our bodies are relaxed during the process, we are able to turn on our parasympathetic nerves which is our build and repair part of the nervous system and it can cause you to become real healthy when you are able to activate it and the more you activate it the deeper you relax and the deeper you can feel effects from things and for longer while the sympathetic(fight or flight) nervous system is the opposite whereas it can be powerful but it doesn't last as long and it gives you energy to move quick but the more you activate it the more you get a burnt out effect after you do what caused the adrenaline release which is probably why when you inhale a strong, concentrated vapor/smoke you get a fast acting, strong high followed by a lasting burnt out feeling. Vaporizers are the PERFECT tool to achieve this "infinite high" because you can adjust the heat to release only certain substances slowly and can use very little which means most of the vapor if not all of it will be absorbed but you will be able to take in a lot of oxygen to help the body metabolize the concentrated vapor(remember the bigger the cloud is the more air is mxing with it and the smaller it is the more concentrated it is IF you have a vaporizer with accurate temperature control and not using high heat in your first puff and using a lot of herb or concentrates). The only thing is most people are so used to the fast hitting, thick vapor and seeing clouds and not being patient that they won't get a chance to experience this other side of cannabis. Anyway, I was just thinking about this after watching youtube videos and noticing people loved seeing the clouds and thick bong smoke or big joints and thought to myself we have barely experienced what cannabis can do and we most likely won't because we are stuck on doing things the old way and need that fast rush that thick smoke/vapor gives you. If my post confused you please forgive me, I just had to get this off my mind with other people who love herb and vaporizers like I do.