In fairness, there was a BBC Panorama style programme a wee while back which showed that a lot of actually counterfeit cigarettes were being prepared on the black market with higher levels of lead (up to 20 times that of conventional ciggies) and being sold at the Barras. The price being pushed up by taxes is a huge push factor when cigarettes, which people have no guarantee of quality control over, are being sold at a fraction of the price.
It's interesting to see that it's not the same with alcohol, but that's because licensing is more rigorously enforced and harder to avoid viz the black market.