If it’s black market, it’s still more of a hassle to buy.
Out of the four smokers I regularly work with three of them have found shops that sell black market tailormades and the other buys pouches off some internet site which is almost certainly also dodging tax. It doesn't seem like they're having any hassles finding and buying these things and with black market apparently being about half the price of cheap legit cigarettes you'd have to be pretty firm on your principles to take the financial hit.