I'm not sure who you are considering as others involved. Certainly the addict's family is involved but I can't support the government legislating that relationship any more than I could them (gov't) setting rules on who gets the TV remote and when, or who decides how to spend the family paycheck.
If you refer to society, through medicare, etc. paying the costs of addiction, I'd urge to solve that problem by favoring the elimination of those requirements rathering than legislating what all of us can and can't do.
Behind the "addicts affect everyone" agrument you find the same dubious, false, and often outright reversed (e.g. the social costs of motorcycle head injuries) arguments as against red meat, cigarettes, alcohol, seatbelts laws, etc.
All of these "causes" are the invitation the government gives itself to make intrusive, freedom-killing, "soft cage" police-state laws. This is why your money is no longer yours, why your doctor no longer works for you, etc. What do want more? Freedom? Or the ability to use government tools to enforce "goodness" that goes well past the absence of real criminal behavior?