It also depends on how long and how frequently you've smoked. If it was one hit, one time only and ever, should be out of your system for a urine test within a couple weeks, if not days. If you're asking how long you stay high off one hit...depends on the weed and how often you smoke. But, usually not very long.
Manufacturers often design e-cigarettes to look like regular cigarettes, but they contain no tobacco and don't require a match -- or any flame at all. An e-cigarette is a battery-powered device that converts liquid nicotine into a mist, or vapor, that the user inhales. There's no fire, no ash and no smoky smell. E-cigarettes do not contain all of the harmful chemicals associated with smoking tobacco cigarettes, such as carbon monoxide and tar.
In an attempt to quit the tobacco habit as many as one-fifth of smokers have tried e-cigarettes [source: Ross]. E-cigarettes were first developed in China and were introduced to the U.S. market in 2007. Many are similar enough in appearance to be mistaken for regular tobacco cigarettes. But one look inside and you'll see the main difference: This is a tobacco-free product. E-cigs are actually vaporizers; instead of burning tobacco, the mechanism heats up a liquid. The liquid turns into vapor, which is then inhaled, or vaped.. While some argue that vapor offers health advantages over traditional cigarette smoke, regulatory agencies and some health experts aren't so sure that's true. Before you consider taking up the e-cigarette habit, read on to get the facts.