I ran accross this little tidbit in my waunderings. Has anybody else seen this claim? This would go a long ways in showing why coffee and cigarettes go so well together. ;D

Caffeine/Nicotine Interaction - Amazingly, nicotine somehow doubles the rate by which the body depletes caffeine. Yes, your blood-serum caffeine level will double if no caffeine intake reduction is made when quitting. Although not a problem for most light to moderate caffeine users, consider cutting caffeine intake by roughly half if troubled by anxieties or experiencing difficulty relaxing or sleeping.

Sourced from: http://whyquit.com/pr/100305.html
Java "With a smoke" phile