You prefer to use your debit/credit card to buy things, because you need the cash for weed.
This is so true, especially recently for me...I owe quite a bit on a credit card now thanks to this behavior, just for basic things like gas/groceries/etc, but I think I've only done it because I could get away with it (probably for the last time too.)
Something I just did tonight qualifies for this thread:
You know you're a stoner when you're almost completely out of weed, so you put metal screens into your beloved glass pieces (in this case, my glass-on-glass Ehle bong) and hit some crystal hash you have left (clearly not direct flame), then get excited over a tiny drop of weed you found in a bag in a drawer, and decide to bong that too, with the screen still in. My bowlhead is sorta weird, its "screenless" so a zigzag pattern, I broke the original one and for some reason, all German bowls have a huge hole, so a glass screen is needed, which I used to use.
One should not be low on weed and using a bong, a bowl is the way to go for conservation. Grossly, with a screen.
You also know you're a stoner when you walk around typing/telling people you're too good for resin, but when you run outta bud/have a low supply, you end up taking resin hits anyway.
You know you're a stoner if you make to-do lists for EVERYTHING because you can't remember shit (school type things are fine, but groceries? large cleaning jobs? packing?)