Yeah, we talked about that in prior threads
1. ANYTHING is better than biting down on lead, so if its non-toxic and fairly soft, it's a GOOD idea, flavored or not. The flavoring is just a bonus.
2. To my understanding, they haven't yet, and I don't think the laws of physics will allow them to, make it from a material that is dense enough to kill effectively, yet still be soft and physiologically friendly.