[sershe]

Where do you draw a boundary? What you're saying is "you are doing a thing that is bad for you, /I/ know better what /you/ should be doing". You can talk about externalities, but unless it's something that is very narrow and direct, e.g. "you ruin your health via smoking so you get charged extra for certain healthcare services", it becomes a slippery slope. "Healthy society" type stuff is especially suspect, stuff like "undermining society/government/cohesion" has been used by authoritarians for the vaguest of reasons.