1 cuz its like breathing fresh air so sweet and sticky n clean
2 any but if travel alot or need a compact 1 they have a model that pretty much a small box that you put your weed in flip the switch and suck out a small hose
3 heats your weed without burning it so only the tch gets mixed into the air not the dirt/plant matter
4 not really just 5 minutes of it uses the same power of a light bulb
If you can afford it, there is nothing better than a Volcano ($600) ,by far the nicest way to smoke. I also at times smoke out of Vapor Genie ($50) Wich works by Heating a stone on top of the bowl with a lighter that vaperizes the herb. Takes a but to get used to but works well and portable.