The Philippines has launched a bloody "war on drugs" that has killed at least 2,400 people in just two months, while neighboring Indonesia has declared a "narcotics emergency" and resumed executing drug convicts after a long hiatus.

In Thailand and Myanmar, petty drug users are being sentenced to long jail terms in prisons already bursting at the seams.

The soaring popularity of methamphetamine — a cheap and highly addictive drug also known as meth — is driving countries across Asia to adopt hard-line anti-narcotics policies. Experts say they are likely to only make things worse.