It will be completely smokeable, but smoking the stems will make it harsh.
Rather than being a result of ruderalis genes, I would suggest this plant has taken extreme sativa expression from the Thai genetics in the blue berry strain.
This is borne out by the fact this plant resembles "Dr, Grinspoon" a 100% sativa from Barneys Farm, which is a cross between a Panamanian sativa and a Thailand sativa.
Hope this helps,........
Organoman.