The Tobacco , Exercise and Diet Messages ( TEXT ME ) trial was a parallel-group , single-blind , randomized clinical trial that recruited 710 patients ( mean age , 58 [ SD , 9.2 ] years ; 82 % men ; 53 % current smokers ) with proven coronary heart disease ( prior myocardial infarction or proven angiographically ) between September 2011 and November 2013 from a large tertiary hospital in Sydney , Australia .