I'm not aware of any restriction on the activities I'm allowed to do, or of anything that I could do that would reduce my coverage.
If anything, insurance company are the most restrictive in this area, I'm pretty sure that if such a proposition was made in Belgium, the minister responsible would be under siege for days.
People have been denied coverage for extremely bizarre reasons that shouldn't even be legal. Including people with very serious diseases. It doesn't take much to google some examples. See also: Denying coverage for preexisting conditions.
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Pretty much all of this applies to junk food as much as it applies to drugs. Except obesity is far more common than drug problems, so it's a much bigger drain on the society's resources. So, should we ban burgers and soda under penalty of years in prison?
Junk food is a much, much hazier area, as what is objectively "healthy" behavior is harder to determine there.
First off, your analogy is a little disingenuous because I don't think drug users should face "years in prison" either. Secondly, the problem isn't any particular food, it's patterns in diet and (very importantly here) exercise that aren't always easy to analyze and vary greatly depending on the individual. Another problem is that food is a necessity, and not everyone
can afford healthy food, hence obesity being more of a problem in poorer communities. It's a pretty complex issue, all things considered.
However, yes, I do think that stemming the obesity problem
is a pressing issue for western society, and that society at large has an interest in doing so. The question is how to do this appropriately. For instance, in many areas, it's not even legal to serve soda in schools, school nutritional/lunch programs are coming under scrutiny, and some states have or have proposed taxes on soft drinks in order to incentivize moderation. I don't mind the idea of economic incentives for people to sell and purchase healthier food, because not only might it prevent unhealthy behavior, but it also might put healthier foods on a more even playing field with regard to choices available to people without a lot of money.
I'm pretty sure G-Flex said he was in favor of decriminalization but not deregulation. And just because obesity is more common than drug abuse it doesn't make it more dangerous. It isn't more dangerous. There are some drugs where it's remarkably easy to overdose, datura for example. Only datura isn't a controlled substance in the US.
I'm in favor of decriminalization in the sense that I don't think someone should go to jail simply for using drugs, because it doesn't actually help. However, I think there needs to be an incentive to
not use, so some sort of mandatory treatment program might be a good idea, or perhaps it depends on the drug in question.