OK here is summary of what people are using for
creating smoke (!!!):
 
Needles from _Pinus strobus_.(White Pine)
bailing twin
sugar wate
burlap bags
needles of Douglas fir _Pseudotsuga mentiesi_
cedar wood chips
 
and some more staff that was not tested or not
favoured.
 
As for us here the favourite has been cypress tree
"leaves". Slightly dry but not entirely. It produces
tons of smoke is almost neutral in smell (slightly
pleasant smell) and seems to work wonders. Of course
cypress trees are in abundance here.
 
Now here is one more for you: What do you use for
your fire producing agent in your smoker? I will get
this started. Now hold your ... keyboards: donkey
manure!!
 
Andreas