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.
If you get strong perfume smell it isn't pure tobacco you are smelling. It is an added fragrance - typically an artificial. I never extracted a tobacco that smelled other than an organic woody plant. The fired cured smell like a campfire, the air dried smell very resinous, the flue cured are sweeter etc.