Miley Cyrus hasn't smoked marijuana in six months.br The 27-year-old has been very public about her marijuana use in the past.br The singer revealed she stopped smoking the substance after going through vocal cord surgery last year.br Cyrus said; "I had really big vocal surgery in November. had freaking four weeks where I wasn't allowed to talk."br Cyrus went on to say that she is enjoying being sober and "waking up 100, 100 of the time".