Is heroin, meth or crack worse?

Is shooting up heroin or smoking crack or doing meth worse for your health? Which takes the biggest toll on society? Please discuss.

Answers:

Heroin itself (if totally pure) doesn't really damage your body unless you OD. Meth bores physical holes within your brain. Crack will make you think people are plotting against you and distribute you psychosis. They are all terribly addictive.