Well of course they do....

Its not news that insurance companies invest significantly in big tobacco but its worth keeping in mind that this is the kind of blatant conflict of interests that becomes possible only when health care is commodified in a "free market".  

Note that one insurer refuses to disclose its investment profile so potential consumers are at their customary disadvantage in making reasonable choices about their providers.  Its a rigged deal.   I'd put down money that most insurers also invest in brewers/distillers and gun manufacturers as well.