According to Melinda in Reader's Digest, she's lost 30 pounds and is "more skittish than I remember." And, given that she has a history of drug addiction, I would not be at all surprised if she was now addicted to meth.

Nah, her teeth are too nice. Must be coke.

Cindy wouldn't be on meth. There are many amphetamines available by prescription, including dextroamphetamine and a mixture known generically as "mixed amphetamine salts" and sold as Adderall as a brand-name drug. If she's on any stimulant, it's most likely Adderall or dextro.

While there is a pharmaceutical version of methamphetamine (Desoxyn), it is rarely prescribed and there's really not many cases where it would work better than the commonly prescribed amphetamines.

There's a nice book on all this by Nicolas Rasmussen titled

On Speed: The Many Lives of Amphetamine It details how amphetamine was first marketed as a treatment for asthma and congested lungs, and soon became used as the original anti-depressant in the early 1940s. Then it's use as a diet drug led to even more usage. Prescription amphetamine use peaked around 1970 according to the book. ADD has returned it to the spotlight, but forty years ago it was even more common than it is today.

Hey, maybe 24/7 stress from campaigning has caused weight loss and nervousness. Ya think?

The New Yorker says she's a size 0.

Seriously, for that kind of weight loss and nervousness, she should probably see a doctor. There are real medical problems that manifest themselves in this way (e.g. thyroid problems)

Radio, true. Crystal meth is a gutter drug that ruins teeth. She can afford the best designer amphetamines in the world.

She also has stellar healthcare should she need to address a thyroid issue.

And if she can't handle the stress of the campaign, she can retire to one of her 9 or 10 houses, or vacation in an exclusive press-free location arriving by private jet.