Drug info - Was SWIM tricked? LSD Tolerance (again)

[Bujin]

A few days ago SWIM found some acid. SWIM has done it once before in his life time, he did 1 hit that time and had a decent trip. Nothing amazing but a little something. This time SWIM ate 2 hits on altoids and got a very small effect, like that when its just starting to kick in. SWIY notices it but nothings really going on and after a few hours that tapered off. SWIM got these altoids and put them in a small paper envelop for the time being and after that SWIM put them in a plastic bag and wrapped them in tin foil for 1 day. When SWIM ate them he waited, after 2 hours SWIM got an upset stomach for a short period, and after 4 SWIM still noticed nothing. SWIM awoke the next morning with a headache and an upset stomach.

SWIM is wondering if it was the storage method or perhaps just SWIMs body that made this not work or was it just bad? SWIM is pretty disappointed