IF YOU HAVE A LIGHTER THAT YOU ARE NOT USING, REMOVE THE FLINT!!!!!
Frozen flints are caused by moisture, spring pressure and time- some are easily removed, some very difficult- all require the lighter to be disassembled and worked on from the top so as to not damage the flint tube itself. In extreme cases the expansion will cause the flint tube to split all the way down into the fuel reservoir at which time the lighter becomes a display piece as it will never work properly unless the flint tube is replaced -even though I have a few replacement flint tubes for Ronson pocket models I do not provide this service as the cosmetic damage is always unacceptable. I do make and install new flint tubes for most Ronson touch tips if needed.