A vapor-dispensing device exhibiting a range of evaporation rates corresponding
to a discernable range of sensory fragrance intensity levels. The vapor-delivery
device includes one or more control structure (e.g., a heat control, a vent control,
and/or the like) configured to allow a user to specify the evaporation rate of
the vapor-dispensing device over a continuous or discretized range of values. In
accordance with another aspect of the invention, the two extremes of operation
correspond to a range of sensory fragrance intensity values that span at least
three minimum perceivable intensity zones.
