If there is a causal link between drug use and community harm, then it no longer becomes a simple case of personal freedom.
If 90% of heroin users reach a state where they do damage to someone else's person or property (theft, etc.) or to where they require the resources of the community to sustain them (welfare, medicare, emergency room care), which they cannot pay for, then their expression of freedom comes at a cost to the community. At that point the community has the right to limit the activity that leads to the violation.
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