Just my opinion: unless they asked your daughter to EAT the pig part, I don't see the relevance of her being vegetarian/vegan. I suspect the point was to gross them out & scare them out of smoking. I'm not sure I agree with using fear as such a constant teaching tool, but I don't really know how I feel about them using a pig part to demonstrate. I think I'd need to know more details about the pig. Like did this pig die a natural death, and then they used its body to demonstrate with, or was this pig killed by tobacco smoke in order to use its lungs as a display (I assume that was the body part)? I'd be OK with the first scenario, not so much with the second. I think if it were my kid, and she wasn't completely traumatized, I'd probably be quiet about it. But I'm like your daughter, and tend not to complain except in severe circumstances.