I use the black normal lamp oil (not bio) from farmlight for many things including smoke It smokes nice but is not as thick as bluemax and disappated quicker also. It is fun enough for every day use. About € 1.69 / L here locally. I mixed with kerosine a bit but that has no effect.
Works great also for torches and lighting the fireplace / bbq
Works great also for torches and lighting the fireplace / bbq