Use marijuana? Thinking about quitting? If so, Stanford University is currently conducting a confidential study to determine if a non-medication treatment, repetitive Transcranial Magnetic Stimulation (rTMS), can help frequent marijuana users reduce their use. Participants will receive study treatment and care at no cost, plus compensation to offset time and travel. Call Brendan at (650) 490-8194 or email QuitMarijuana@stanford.edu and ask about the rTMS for Marijuana study.