Smoking

Smoking may have some benefits, in the past the taxes that are gained from those who smoke have been used to finance the NHS as well as the police force. However as smokers increase so does the health risk, resulting in a drain in the economy. For example the money that is used to fund the NHS is the same money that will be re-used to help those who fall ill due to smoking in the first place.

http://www.mindfully.org/Health/Tobacco-Helps-Economy.htm

http://www.jrussellshealth.com/smokteens.html