So which drug is the most addictive? Is heroin worse than crack, or was meth the terrible winner?

Actually, the most addictive drug, as determined by a survey of addiction experts, was a legal one - in fact the only drug to get a score of 100 was nicotine. Check out the list and the addiction scores of commonly abused drugs.

• Cocaine addicted monkeys placed in larger and nicer cages use less cocaine.
• Cocaine addicted monkeys placed in smaller and less stimulating cages use more cocaine.

Since monkeys are a pretty good indicator of human behavior, maybe we shouldn't put people in small and sterile jail cells after we catch them using cocaine?