Many physicians recommend a vaporizer to administer medicinal cannabis, because it eliminates the harm to the lungs that occurs when cannabis is smoked. Another reason is that cannabis is easier to dose with help of a vaporizer compared to smoking or oral ingestion.
With vaporizing there is no smoke. Temperatures range anywhere from 340 - 420 degrees. We usually vape the higher temps with a water tool or if we are vaporizing wax or shatter. You don't get tar, that's why it's way healthier than smoking.
The optimal vaporization temperature for cannabis varies between 365°F and 450 °F (185–210 °C). Preferred temperature settings can vary from person to person, as different temperatures can affect the medicinal properties. Note that not all vaporizers can be temperature controlled and that some (inexpensive) units don’t always accurately display the current vaporization temperature.
In general, lower vaporization temperatures (under 374°F/190°C) give a more psychoactive high, whereas higher temperatures (428°F/230°C) allow for a more sedative body high (or rather, a stoned/couch lock effect).
Of course, both the quality and variety of cannabis that is used also have a great impact on the effects from vaporizing it.
Your ABV (already been vaped) is what is left over after vaporizing. You vaporized most all the goodies out of your cannabis if there is no more vapor left. You've extracted the THC, CBD etc...from your herb. Your ABV is usually dark to a medium to a light brown depending on the cannabis and it feels relatively dry and crunchy. It shouldn't be black. No combustion happens if you are truly vaporizing and no tar.
Folks use the ABV to make edibles, they may decide to leave a little life in their leftovers for future use in food such as butter or oils. You can also add ABV directly to food that are high in fat such as peanut butter. IMO it's hard to control the effects of edibles, there are so many variables. Sometimes or should I say often I don't feel results or it hits me like a brick and is too potent.
EDIT
I kept thinking of extras to add, so this post continued to grow.