What is the worst drug?

All drugs are potentially dangerous and have varying effects on individuals, so it is not possible to name the worst drug. For more information on the effects and risks of various drugs go to the A-Z of drugs.

Some drugs are more highly addictive (e.g. crack cocaine, heroin and tobacco); some are liable to cause dangerous immediate effects (such as the hyperthermia seen with ecstasy use or heart attacks with crack use); some can lead to specific long term physical damage (including crystal meth, ketamine and alcohol); and some drugs  can have a stronger psychological or psychiatric impact and might, for example, trigger onset of pre-existing mental conditions (with khat, amphetamine or cannabis known to have these effects). However, there's no way of you knowing beforehand the harmful effects to which you may be particularly sensitive.