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.
The most common source of bad smell and odour in your vehicle is the air conditioning system. This is because it is a small enclosed space that is constantly wet and moist. This gives rise to formation of mould, bacteria and fungus especially around the condenser and evaporator of the air conditioning unit.