Yes. Just like most people don't bother building their house because it's too much work; logic dictates the lazy stoners who would be stupid enough to leave their THC candy laying about aren't going to bake their own brownies and even if they did they would probably make enough for themselves and their friends to consume right afterwards, not leave them laying around for their toddlers to eat.
That's just a guess though. That's how we do things around here, right? Just hunches and guesswork?