Cocaine withdrawal
On February 14, 2011, two Swiss psychologists published two years' research on cocaine addiction.  They found that addicts who gambled were less likely to use cocaine or to relapse on cocaine.  They think gambling may refocus the brain's "reward center" from cocaine to gambling.  They said that psychotherapy should be used along with gambling.  More research is being done on long-term relapse rates (the number of people who eventually start using cocaine again).