Complete and utter alienation from family and friends. Even among rich people who don't have to steal to feed habit. Shaking hands. Noticeable inability to focus, to converse normally. Verbal and cognitive abilities erode noticeably over time. Hillary's brand of semantic deviousness requires a degree of mental agility that an addict just wouldn't be able to retain over time.
Apathy. Sloth. Chronic inability to show up for work, especially Mondays. Warped concept of time. Memory impairment. (OK, I know....)
Crack heads do cough, but Hillary would be thin as a rail if she were using crack. At her age, any usage of cocaine would be "chronic". No way to just dabble in this stuff at this stage of her life. Drug addicts, in general, lack ambition and drive, are anti-social, drug is only BFF needed.
Bill? Now THAT'S another story. Inability to maintain natural body mass? Check. Bulbous redish nose? Check, although virtually no one does powder anymore. My guess is Bill is on the wagon now, from whatever demon chemical. He's also just a bit more....functional, than a current chronic user would be, IMHO.
Actually, I do need to correct this, I have known some heavy crack users who actually had the opposite problem, they became quite corpulent, chronically so. At some point, it seems to become extreme, one way or the other.