From McDermott's Guide to the Depressant Drugs:
If pharmaceutical heroin is holy grail of opiates, then Diconal is the Lost Ark of the Covenant. For everybody who tried them, Diconal immediately became the drug of choice. Diconal is a drug cocktail with the most amazing rush known to man. Unfortunately, in accordance with the great cosmic law of nish for nish, it also happens to be one of the most destructive forces known to man. The drug comes in pink tablets that are made from silicon rather than the more benign chalk base. After a couple of hits, your veins become filled with sand and get as hard as glass. Keep on injecting and you end up with abcesses and ulcers at best, and amputated limbs if you are unlucky.
Hmm, yet another self-limiting drug. How wonderful.