This is a very interesting thing and one I've not heard of to be honest. Wanting to taste the things one smells.
Concrete? Hmm...I'd probably say concrete might be a bit tough to chew...But sand...Yeah, that's probably way easier to eat! Same with chalk...I haven't eaten any but they look like lollies to me so I've often wondered if they have different tastes to go along with the different colours? Maybe you could clarify?