Laissez Faire. To each his/her own. As long as "they" don't do any harm to other people what do we care what they do to themselves?

If they want to gorge themselves to death or drink themselves to death or drug themselves to death.

Do we have an obligation to engage in intervention or an obligation to let people alone to "do their thang" providing no one else gets hurt?

Is there a societal conscience/collective conscience that should prevail or is a conscience limited to the individual?