since, sense, scents, cents, cense and sence

since: ago, before now; from a past time to the present

sense: a feeling or perception; a faculty or function of the mind

scents: odors or smells

cents: monetary units 

cense: to perfume with incense

and just for good measure..
sence: slang for marijuana

Since I used my last cents to purchase sence, I can't afford to cense the scents. I sense this may be a problem.