Demand isn't the question — the regulator is
Most market-entry reports open by asking whether the demand is real. Here it plainly is — 10.4% of adults of adults vape, more than smoke. The whole question is the second wall: the state. The UK has decided vaping is a youth-harm problem and is actively shrinking the category. So this report is mostly about one thing — can you legally and profitably operate as the doors bolt?
The demand is settled; the gate is everything.
So, for an entrant → Underwrite the regulation, not the demand.