An addiction to or habitual use of narcotics that one snorts up one's nostrils, most commonly cocaine. She developed an expensive nose habit working on Wall Street.I had a bit of a nose habit during college, but I gave all that up after I graduated.
nose habit
n. an addiction to sniffed drugs, usually heroin or cocaine. (Drugs.) One sniff of that white powder and she’ll get a nose habit, for sure.