A guy who eschews alcohol because his older brother died at a young age of alcoholism would do coke? I don't think so. At least Libs' and Progs' false claims that GWB did coke has some indirectly supportive basis in GWB having been a border-line (or worse) alcoholic.
Just get used to frivolous accusations of drug use being added to Libs' and Progs' ad hominem attack arsenal, along with accusations of racism, misogyny, homophobia, etc..