I haven't had time to respond to this properly before now, but I do disagree quite strongly with what you are saying leftwing.
It is certainly
not "fair enough" to "pipe up" if someone wants to use when they are receiving pharmacotherapy. It is
not harm reduction to do so either.
Let me attempt to explain:
There is a nice definition of harm reduction, by
Diane Riley and Pat O'Hare, listing 4 basic principles:
Pragmatism
Humanism
Focus on harms (rather than drugs used)
Hierarchy of goals
Telling people they shouldn't use heroin if they are on pharmacotherapy definitely fails point 3 above. Furthermore, pharmacotherapy isn't about abstinence anyway, it's about reducing harm. In a perfect world everyone would have access to prescription heroin as treatment (not just Switzerland, Germany, the Netherlands, and some lucky sods in Canada and the UK) and we wouldn't even need to have this conversation.
More's the pity - because I certainly
do know what harm reduction is.