Variables related to the questions asked of all sample persons age 18-44 include:

• COKAGE1ST: age first used cocaine

• COKXLIFE : number of times in life used cocaine

• COKLASTUSE : time last used cocaine

• COKMOSYR : number of months used cocaine in the past 12 months

• COKUSEAMT : how often used cocaine on average

• COKXDAYYR : times per day used cocaine

• COKUSNIFF : sniffed or snorted cocaine in the past 12 months

• COKUSWAL : swallowed or drank cocaine in the past 12 months

• COKUSINJ : injected cocaine into a vein or muscle with a needle past 12 months

• COKUSMOK : smoked or freebased cocaine in the past 12 months

• COKUSOTH : used cocaine in some other way in the past 12 months

• CRAKLASTUSE : the most recent time used the form of cocaine known as "crack"

These persons were asked if they had ever:

• Used cocaine more than she/he thought she/he would (COKMORPLANEV)

• Tried to cut down or stop using cocaine but found that she/he couldn't (COKCANTCUTEV)

• Used cocaine every day for two weeks or more (COKDALY2WKEV)

• Been high on cocaine or feeling its aftereffects while at work or school (COKHIWKSCHLEV)

• Been high on cocaine or feeling its aftereffects while at home, taking care of her/his home or family (COKHIFAMCAREV)

• Skipped going to work or school because she/he was high on cocaine or feeling its aftereffects (COKSKIPWKSCHEV)

• Had problems with work, school, or the police because of using cocaine (COKWORKPEV)

• Continued to use cocaine even though she/he knew it was causing problems with work, school, or the police (COKWORKPEVUS)

• Failed to take care of her/his home or family because she/he was high on cocaine or feeling its aftereffects (COKFAMFAILEV)

• Had problems with family or friends because of using cocaine (COKFAMPEV)

• Continued to use cocaine even though she/he knew it was causing problems with her/his family or friends (COKFAMPEVUS)

• Driven a car or other vehicle within 1 hour after using cocaine (COKHICAREV)

• Spent less time on activities that were important to him/her so that she/he could use cocaine (COKCUTACTEV)

• Had health problems caused by using cocaine (COKHPROBEV)

• Continued to use cocaine even though she/he knew it was causing health problems (COKHPROBEVUS)

• Felt depressed or uninterested in things, or suspicious or distrustful of people because of using cocaine (COKDEPRESEV)

• Continued to use cocaine even though she/he knew it made her/him feel depressed or uninterested in things, or suspicious or distrustful of people (COKDEPRESEVUS)

• Built up a tolerance to cocaine so that the same amount had less effect than before (COKTOLEV)

• Felt sick or irritable because she/he stopped or cut down on her/his cocaine use (COKCUTSICKEV)

• Used alcohol or drugs because she/he felt sick when she/he stopped or cut down on cocaine use (COKALCSICKEV)

• Gone to a self-help group, counselor, doctor, or other professional to get help because of cocaine use (COKGOHELPEV)

If persons reported using cocaine in the past 12 months, they were asked if the same scenarios had happened in the past 12 months. Variables about cocaine with names ending in EV (like those listed above) are scenarios asked only of persons who used cocaine at least once in their lives. Variables about cocaine with names ending in YR are only asked of respondents who used cocaine in the past 12 months.

Variables about cocaine with names ending in LP indicate lifetime prevalence variables and were only asked of persons who reported using cocaine ever in their life. Persons who reported never using cocaine are included among the no responses for lifetime prevalence variables rather than being treated as NIU as they are in the variables with names ending in EV.

Cocaine variables with names ending in YP are year prevalence questions. While technically year prevalence questions were only asked of persons who reported using cocaine in the past 12 months, respondents who reported never using cocaine or last using cocaine over 12 months ago are recorded as responding no instead of treated as NIU as they are in the cocaine variables with names ending in YR.