This 'old chestnut' raises its head every couple of months on PPrune and I am amazed how apologists for smoking on the flight-deck emerge. Indeed, in this day and age I am even more astounded that it even goes on, especially in the US of A where I would have thought a lawsuit would be filed against the offender at the first sight of a cigarette packet. If it is against company regulations then that is that. Point it out to the addict and if the selfish so-and-so continues report the matter. If your company will not support you then I would suggest finding another employer. You have every right to enjoy a clean and healthy working environment. The final contingency - don your oxygen mask and smoke goggles and file an ASR for smoke on the flighdeck.