[CharlieO]

Well generally a healthy person cannot do much to improve the cost they cause.

Plus it is an average, smokers and obese people only make up a fraction of the population which is why theirs is smaller. So some healthy people who may need huge costly surgeries push the average up by none of their own doing. It also depends upon what type of average they are using.
I can't believe some people just trust everything they read without actually thinking of why the figures may show this.