The Pisstakers is a nuclear drug-free zone, but just for a bit of fun, match the drug with the relevant bar on the graph. The one on the left is the worst for you.

Heroine - Khat - GHB - Alkyl Nitrate - Cocaine - street methadone - alcohol - cannabis - tobacco - Anabolic Steroids - solvents - barbiturates - ketamine - amphetamine - buprenorphine - 4-MTA - methylphenydate - Ecstasy

The answer is here. on the BBC website.