Hey all. Been wanting to try a smoker and it looks like from a budget perspective, a drum smoker might be the way to go. I have a few questions though before I make the leap. I have access to a few free drums. A friend of mine has them and said that they contained food products (cooking oils I think). Is it a safe assumption that they are unlined since they contained food product? How does one tell if they are lined? Would the lining be visible?