I know that it is somewhat common practice to pick up vintage tins of 20, 30, 40, or even 50 years old on occasion from pipes/tobacco swaps/shows, or from wherever they may become available. And I know this may be a noob question, but what do you guys think about smoking these vintage tins? What is there to generally look out for? Any reason not to smoke a vontage tin ? Please share your thoughts and experieinces about the safety of smoking vintage tins.