A good general rule is "Don't use man-made or
processed items as smoker fuel". Chemical, paints,
metals, and who knows what else may be present. The
paint on that burlap sack may be toxic when burned.
That cardboard may have been sprayed with a roach
kiiler.
 
        One reliable source is wood chips/sawdust sold
as bedding for hamsters/rabbits. Either pine or cedar
or a mixture gives a nice smelling smoke. If you have a
saw mill or even a cabinet maker locally you might even
get all you want in exchange for a jar of honey. Just
make sure it is only unprocessed wood and not something
with resins (particle board, masonite ect.).
 
        For the more frugal with woodlands about,
collecting well rotted, punky wood; the kind that is
spongy and wet and drying it provides a good natural
and free source of fuel.
 
        Adding dryed sumac flower heads can make a very
pleasant smelling smoke. I'm sure the bees could care
less but there is no point in assualting your nose and
eyes.
 
        Jim Moore