Use marijuana? Thinking about quitting? If so, investigators at Stanford University are currently studying a candidate treatment for problematic marijuana use called repetitive Transcranial Magnetic Stimulation (rTMS). By participating in this trial you will both receive a study-intervention that might help you, and you will also be helping the investigators understand whether the study-intervention might help others who are also trying to quit using marijuana. All participants will receive counseling to assist them achieve their marijuana related goals at no charge. Compensation is available to participants to offset their time and travel. By participating in this trial you will be contributing to science and potentially the development of a new treatment to help others. To qualify for the study you must: -Be between the ages of 18 and 65 -Use marijuana regularly and have negative effects from your marijuana use -Want to quit or cut down on your marijuana use -Not have problematic use of other substances such as alcohol, opioids, or methamphetamine For more information, please go to bsl.stanford.edu. If you are interested, please complete this short survey link, and one of our team members will reach out to you shortly.