Part of the reason is that, used as directed, the Box only produces vapor when you need it--there is never any vapor/odor directly vented to the room. Most vaporizers, once started, will also stay going until the load is completely spent (constant heating). Since the user can only take in vapor intermittently with the breath, that means that with most vaporizers there will always be occasions where the heated materials will be venting to the room--hence the smell. With the Box, the heating is itself intermittent and matches consumption. The user consumes and adsorbs the smell along with the medicine--hence no aroma is ever directly vented to the room.
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