I have never, in my life, finished a chapstick, lip balm, lip gloss or lipstick. I either lose them, I get tired of them, or they become disgusting from living in my purse/pocket/backpack/car and I throw them out.
Photographic Proof:
(Not pictured: the lipsticks from my makeup bag that I can't be bothered to dig out. There are about 8, anywhere from a year to six years old.)
I KNOW this about myself, so I never buy chapstick. So, the mystery is... where did they all COME FROM?!