Percocet used for pain relief is a narcotic medication and prescriptions can prevent people from getting high on Percocet without medical reason.In fact, the Percocet high feeling can get you into lots of problems.
I think the formula of the perfume itself decides how fast it will spoil. My perfumes from Britney Spears Curious and Salvatore Ferragamo went bad within a year and a half. The Britney Spears one developed some precipitation and started smelling like alcohol, while the Salvatore Ferragamo just smelled plain weird.
When you smell perfume on a person or by wafting perfume from a bottle, you are smelling a vapor of the scent compounds that have become volatilized (are in the gas phase) and diffuse through the air and into your nose. Perfume is a mixture of fragrant oils in an ethanol/water solvent.