The only reason it's red actually is because of burns and irritation to mucus membranes. It's far less dangerous than most. So yellow would probably make more sense.

Pain must be relatively immediate to qualify for owe, my ass. Some of the yellow ones are insidious killers indeed.

Edit: I'm making the distinction that I'll make ones that cause relatively guaranteed death purple.

Eh, you'll shit it back out

Nitrogen and noble gases shouldn't be a problem either

If it's resilient enough to survive hitting a toilet from three stories up, it's probably safe to put up your butt.

The assumption is that all elements are in solid form at STP and crumbly/unwieldly elements have a suitable binding agent. Or you know, determination I guess?