Because pubs are closing at an alarming rate, people's livelihoods in many cases going down the drain. Why should the Government ban people from carrying out a perfectly legal activity (smoking)? I don't agree either that those who wish to remain smoke-free should be subjected to smoking, therefore give people the choice of smoke-free pubs and those where smoking is permitted.
Give people the CHOICE by having pubs etc where smoking is permitted and those where it is not. Neither group is then discriminated against.