This is what you need to remember as a non-smoker. When you first started smoking, you could be excused for believing that you would only smoke for a week or two and perhaps you didn't even pay for them then. "I won't buy any myself, that way I'm not a proper smoker!" But that first cigarette has led to all the others and all the relative cost, financial and otherwise.
Luckily, you won't have that excuse again. Just one cigarette is impossible. Next time someone offers you one, you know it can never be just one. It will lead to the whole thing starting over again. Faced with that choice, we believe there's no chance that you'll take that one cigarette.
For further ideas and advice and ways to stop smoking, visit the substantial resources section of this site - Stop Smoking Resources