YES! I am the biggest drug hoarder, infact I generally re-up on drugs before I run out of them so then I am never totally dry. I like to have a collection of various drugs and I will save the last of drugs that are not easily obtainable for me for a long time.
When I used to smoke weed I would save a gram or a couple grams of all the better batches I picked up and would usually have 3-5 different types of weed I could smoke at any given time, sometimes more.
Even with cigarettes and alcohol I pre emptively buy more before I can run out and I wont finish a worthwhile prescription before I have managed to acquire another script. As you can probably tell from this post I am kind of OCD about my drug use but it is just so I can never end up in a bad spot.
Awesome thread, good to see I am not the only freak out there. lol