1. [1960s+] (US drugs, also Mr. Jones) drug addiction, esp. to heroin.
2. [1960s+] (US drugs, also A-jones) a heroin addict.
3. [1960s+] (US drugs) heroin.
4. [1960s+] the symptoms of heroin withdrawal.
5. [1970s+] (US) a strong craving or habit, whether for cigarettes, food, a person or anything, e.g. a love jones, a chocolate jones.
6. [1980s] (US drugs) a marijuana cigarette.
[1970s+] (US black/drugs) a heroin dealer.