It's almost all domestic demand growth. Export grew a little faster, but about 80% of C&D's sales are domestic, so most of the growth is from pipe smokers in the US.
And it's fairly broad-based. If you mean on the individual level, that's sort of the nature of the product: it would take a herculean smoking effort for an individual to consume 0.05% of C&D's annual output (and C&D is quite small as far as pipe tobacco factories go).
Broadly, what's happened is that while pipe smoking has declined, the hobby/premium/sophisticate end of the market has grown. The pipe and pipe tobacco market used to be dominated by people who smoked mass market pipe tobacco in relatively inexpensive pipes (and didn't buy many pipes). The market has shrunk overall, but it also shifted towards people enthusiastic about pipes and pipe tobaccos, tend to be more engaged and tend, overall, to smoke less, but also tend to smoke a wider range of pipe tobaccos, particularly premium tobaccos.
So, that's also the answer to why factories like Gawith and C&D are running at capacity and failing to keep up while other factories have closed in the past few years. The market is shrinking, but a subset of the market is growing rapidly.
Sykes