Expired Foods

I never considered specific food related addictions, but here are some courtesy of the Straight Dope:

"Pagophagia, a hankering for ice (one sufferer admitted to a five-tray-a-day habit supplemented by bags of crushed ice obtained at convenience stores)

Xylophagia, a yen for wood toothpicks

Coniophagia, a lust for dust from venetian blinds

Gooberphagia, pathological consumption of peanuts.

Other cravings include ten bunches of celery a day, a peppermint Life Saver every five minutes, salad croutons by the handful, coal, foam rubber, and worse. One woman, a nonsmoker, reportedly "would burn cigarettes to obtain the ashes" and when her husband smoked would follow him with cupped hand to catch the ashes as they fell."