EXHIBIT 99 March 21, 2019 United Cannabis Corporation Attn: Earnest Blackmon, Chief Executive Officer United Cannabis Corporation 301 Commercial Road, Unit D Golden, CO 80401 (303) 386-7104 Email: eb@unitedcannabis.us Re: Resignation from the Board of Directors & CTO Role Dear Ernie: I am writing to tender my resignation from the Board of Directors and as the CTO of United Cannabis Corp. (the "Company") effective March 21, 2019. I am writing to confirm our discussions that I am stepping down from UCANN's Board of Directors and as UCANN's Chief Technical Officer effective today. I have enjoyed my time in these roles and am looking forward to my new role as UCANN's Prana Specialist. Sincerely, /s/ Tony Verzura Tony Verzura cc: Chad Ruby John Walsh