Here's another interesting thought...So many millions of Americans are heavily (read physically) addicted to such a wide range of drugs. Not just the opiate-based ones you think of immediately, but the Benzodiazepines like Valium, Ativan, Xanax, et all and don't forget the Antidepressants, the SSRI (selective Serotonin Reuptake Inhibitors)...Oh, yeah, those baby's are highly and physically addictive. If there ever was a long term shutdown or disruption in the flow of commerce, you could see some real nuttiness across the country as people detox and go through withdrawal en mass coming out the other end with a newfound clarity, hopelessness and follow though.