I agree that everyone is free to make up their minds regarding bringing excess cigarettes out of Bulgaria, but it should be an informed decision with regard to possible consequences.
At the Bulgaria end it is an offence to attempt to export more than 200, the very least consequence of which is that they are confiscated. You could be detained long enough for you to miss your flight, or even be arrested and brought before a Bulgarian court.
At the UK end, once again confiscation is the very least you can expect, prosecution and a hefty fine could follow.
With this information now before you, you can judge for yourselves if it is worth the risk!!
Peter