Food/Drink 'buffs' forever.
 

You will receive the effects of a food/drink item without consuming it if you leave it in your "first food or drink slot" and consume other food/drink manually.

The 'candy corn' given out during the Halloween event is essentially another slot item. People are able to keep those effects indefinitely by managing their food manually.

not exactly a bug. this was done with stat food on live all the time. though maybe not thought out well.

What IS a bug is food duration not being in yet

Did the GMs intend to give players... 8 str, 2 sta, 5 cha, 8 wis, 8 int, 2 agi, 90 hp, 90 mana... forever? I doubt it.

Or maybe it'll all poof in a few days or weeks, and it was really just temporary? GM's are sneaky suckers, you know...

This is how stat food/drink has always worked in EQ. Putting rare stat food in your first slot and force feeding yourself is a classic strategy.

Ever heard of Bristlebane's Party Platters?

If you haven't I feel bad that you never got to experience PoP at its peak.

Yep, not a bug, bro. I made Snake Steak for poison resistance or Velious giant steaks for str/sta and stuffed down a bunch of rations or whatever so it would last. However, even if you OCD right-click food/drink often, it's hard to be perfect about it, and my supplies of stat food dwindled until eventually gone.
Interesting choice to give such a powerful food, though.

Thats how stat food has always been used

very few candy corn will remain by the time we reach next years Halloween event. Someone is ironically salty about not receiving this sweet treat !