So, this chapter talked a bit about wood smoking for bacon and actually mentioned the horrible old practice of dousing food in liquid smoke that was prominent in the 80s and 90s. Applewood smoked bacon was one of the woods used, which is a good one for wood smoking.
One that wasn't mentioned though is hickory. I don't know about the availability of hickory wood in Japan, but if you're gonna smoke something, hickory is a good one to use that wasn't mentioned.