addict

If you are a cookie addict, it means you are addicted to cookies. You just can't get enough of them.

Of course there are far more serious forms of addiction out there. The word addict is usually used to refer to someone who is addicted to drugs. Even good things can get you addicted. Work addicts are called workaholics. There are no words for the dangers of being addicted to reading (well, there is "biblioholism"), to the Internet, or to exercise, but those addictions are also real.

Definitions of addict
  1. verb
    to cause (someone or oneself) to become dependent (on something, especially a narcotic drug)
    synonyms: hook
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    type of:
    accustom, habituate
    make psychologically or physically used (to something)
  2. noun
    someone who is physiologically dependent on a substance; abrupt deprivation of the substance produces withdrawal symptoms
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    types:
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    caffein addict, caffeine addict
    someone addicted to caffeine
    drug addict, junkie, junky
    a narcotics addict
    speed freak
    addict who habitually uses stimulant drugs (especially amphetamines)
    cocaine addict
    a person addicted to cocaine
    binger, crack addict
    someone addicted to crack cocaine
    heroin addict
    someone addicted to heroin
    opium addict, opium taker
    someone addicted to opium
    withdrawer
    a drug addict who is discontinuing the use of narcotics
    type of:
    drug user, substance abuser, user
    a person who takes drugs
  3. noun
    someone who is so ardently devoted to something that it resembles an addiction
    “a golf addict
    synonyms: freak, junkie, junky, nut
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    types:
    gym rat
    someone who spends all leisure time playing sports or working out in a gymnasium or health spa
    type of:
    enthusiast, partisan, partizan
    an ardent and enthusiastic supporter of some person or activity
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