evanescent

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Remember it as "I want scent. Scent evaporates like vapour.

Vanishing Scent

e-vanescent.. vanescent sounds like vanishing.. hence..

EVADE+SCENT....evading scent....

Even most persistent sent last only for a little time and then evaporates.

Evaporated scent;just like its vapors,disappearing from sight and memory

Evaporate as Scent

HEAVEN SCENT