The most frequent lighters used by cigar smokers are torch or jet flame lighters. They’re powered by butane, a liquid gas that’s easy to come by and quite cheap. However, you should not use any butane to fill or re-load your lighter. The most refined butane, not the stuff sold behind the counter at the corner convenience shop, is what you want. This is because the more refined the gasoline, the fewer contaminants there are in the gas. Vector butane, for example, has been refined five times, while Xikar’s PurofineTM butane has been refined to the point where impurities are less than 15 parts per million, making it suitable for use in all jet flame lighters. The cleaner the fuel, the more efficiently your lighter will operate, and the likelihood of clogging will be substantially reduced. Never utilize any type of fuel that hasn’t been triple refined.