I have a love affair with potions and scrolls. I love, Love, LOVE handing out one use items way more than multi-use items. My players know this as I've just come out and baldly stated this fact. So they use potions and such all. the. time. This is, I assume, because they know that more are coming. What this also means is that I can pound the crap outta their characters with monsters that have special effects/attacks/etc. and they have a reasonable chance of surviving. It's also super fun and fascinating (for me) to watch them figure out creative uses for weird potions and scrolls.
YMMV, of course.
Using the poll above, I selected once a short rest because it was the closest.