Methamphetamine has a half-life of 12 hours, compared to cocaine which has a 1 hour half-life.
Opium gum production, used to create heroin, in Columbia and Mexico makes up less than 4% of the world's total production and Colombian production has been cut by 60% since 2001.
The recreational use of inhalants, or huffing, refers to the intentional breathing of vapors with the purpose of getting high.
Vicodin withdrawal can occur when someone has been prescribed the drug or when someone is abusing the drug has developed a tolerance and dependence to it.