<p>A friend died huffing a few years ago and she was a very successful student, just gotten her master’s. It was horrible. </p>
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<p>As has been pointed out, he’s 18 so doesn’t have to do rehab or counseling but you may be able to give him incentive to do one or both.</p>
<p>I don’t have any concrete suggestions but do want to show my support. Tough situation.</p>