New Yorker article this week in which the author speaks to several people experimenting with trancranial stimulation as well as a personal trial.

http://www.newyorker.com/magazine/2015/04/06/electrified

Most relevant sentence for meditators:

In earlier studies, Witkiewitz and her colleagues found Vipassana, a Buddhist meditation practice, to be more effective at preventing drug relapse than either cognitive behavioral therapy or twelve-step programs.