Thanks. Quite a surprising finding. That article links to another one from the NY times [1], with this interesting line: The researchers found that from age 20 to 56, obese people racked up the most expensive health costs. But because both the smokers and the obese people died sooner than the healthy group, it cost less to treat them in the long run.

[1]: http://www.nytimes.com/2008/02/05/health/05iht-obese.1.97488...