Um...
As far as I was aware, whilst heroin is cripplingly addictive it is actually one of the least physically damaging drugs you can take.
( Madam Marlboro wonders if you've found her yet, Tue 23 Dec 2008, 11:06, 1 reply)

it was my understanding
that it's the shit that gets mixed in that does the damage.
( Vipros. clever got me this far, then tricky got me in, Tue 23 Dec 2008, 11:10, closed)

Agreed
Look at the Rolling Stones...

Methadone is also far more physically addictive than heroin, despite its placement on the graph.
(Son of Sam-i-am We're all as mad as hatters here, Tue 23 Dec 2008, 11:16, closed)

My understanding
Was quantity matters - less harmful than cocaine (fractionally), but you take more of it over time to get a reasonable kick.

I presume this graph is a snapshot of a newish users in reasonable levels of consumption (i.e, still a fair while before their bucket kicking commences).
(FunOnABun Smears lard on you!, Tue 23 Dec 2008, 16:18, closed)