If something ends in smoke, it produces no concrete or positive result. This expression refers to the boasting by a person, of having put in a lot of efforts by him, for a particular cause or to attain a result which is very difficult to be done by any person. (This mainly refers to an investigation of a crime or solving a serious offence or a mystery). But at the end, when the desired result is not obtained, his claims are found to be false and not worth mentioning. So, he looses his credibility.
(UK) A large surplus of anything:
We've got enough coffee to cobble dogs with.
A cobblestone is a cut stone with a curved surface. These were set together to create road surfaces, in the days before the widespread use of asphalt. The image the phrase contains is that, even after all the roads have been cobbled, there are so many cobblestones left over that things that don’t need cobbling – such as dogs – could still be cobbled.
A cobbler repairs shoes, so if you have enough leather to cobble an animal with four feet or that doesn't need shoes, you have a surplus.
People sometimes say that every cloud has a silver lining to comfort somebody who's having problems. They mean that it is always possible to get something positive out of a situation, no matter how unpleasant, difficult or even painful it might seem.