addict (
http://definr.com/addict)
n 1: someone who is so ardently devoted to something that it
resembles an addiction; "a golf addict"; "a car nut"; "a
control freak" [syn:
nut,
freak]
2: someone who is physiologically dependent on a substance;
abrupt deprivation of the substance produces withdrawal
symptoms
v : to cause (someone or oneself) to become dependent (on
something, esp. a narcotic drug) [syn:
hook]