I agree that smoking is a waste of money. From the numbers that I've seen (http://www.betterhealth.vic.gov.au/bhcv2/bhcarticles.nsf/pages/Smoking_the_financial_cost), smoking wastes a ton of money that could be spent doing something else. Along with the financial costs, the health risks that smoking brings just isn't worth it.
It may be a waste of money, but some people get addicted for free.