I was reading an interesting case online the other day called Hamer v. Sidway. In this gem of a case, an uncle promised 5,000$ dollars to a nephew in exchange for righteous living by the nephew until he was 21. Ultimately, even though the nephew kept his promise, the uncle died without paying the sum of money, and the trustee of the uncle's estate refused to pay.
So, what happened in the case? Well, the link that I provided wouldn't tell me, so I had to search the case on Google. It looks like the nephew (Hamer) won the case.
Good for him. Giving up smoking is the hardest thing to do. I hope he wins a dollar.
Note: I am not a lawyer. I have moral values, and I don't like screwing people for the sake of money, nor do I like quibbling over things that have an obvious interpretation.