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Shifting characteristics of ecstasy users ages 12-34 in the United States, 2007-2014. Drug Alcohol Depend (2017) 0.75

Illicit use of specific prescription stimulants among college students: prevalence, motives, and routes of administration. Pharmacotherapy (2006) 3.40

Trends in marijuana and other illicit drug use among college students: results from 4 Harvard School of Public Health College Alcohol Study surveys: 1993-2001. J Am Coll Health (2004) 3.17

Into the world of illegal drug use: exposure opportunity and other mechanisms linking the use of alcohol, tobacco, marijuana, and cocaine. Am J Epidemiol (2002) 3.13

Neighborhood environment and opportunity to use cocaine and other drugs in late childhood and early adolescence. Drug Alcohol Depend (1996) 3.08

Drug exposure opportunities and use patterns among college students: results of a longitudinal prospective cohort study. Subst Abus (2008) 2.95

Increased use of marijuana and other illicit drugs at US colleges in the 1990s: results of three national surveys. Addiction (2000) 2.57

Risk factors for drug use among adolescents: concurrent and longitudinal analyses. Am J Public Health (1986) 2.19

Illicit use of prescription ADHD medications on a college campus: a multimethodological approach. J Am Coll Health (2008) 2.14

Male-female differences in the earliest stages of drug involvement. Addiction (1999) 1.86

Prevalence and early detection of heroin abuse. Br Med J (1968) 1.68

Comparative epidemiology of initial drug opportunities and transitions to first use: marijuana, cocaine, hallucinogens and heroin. Drug Alcohol Depend (1999) 1.63

Initial opportunity to use marijuana and the transition to first use: United States, 1979-1994. Drug Alcohol Depend (1997) 1.44

Male-female differences in transitions from first drug opportunity to first use: searching for subgroup variation by age, race, region, and urban status. J Womens Health Gend Based Med (2001) 1.42

Pathways to cannabis abuse: a multi-stage model from cannabis availability, cannabis initiation and progression to abuse. Addiction (2009) 1.33

Nonmedical use of prescription stimulants during college: four-year trends in exposure opportunity, use, motives, and sources. J Am Coll Health (2012) 1.32

"Unequal opportunity": neighbourhood disadvantage and the chance to buy illegal drugs. J Epidemiol Community Health (2004) 1.31

Drug use opportunities and the transition to drug use among adolescents from the Mexico City Metropolitan Area. Drug Alcohol Depend (2007) 1.27

Maintaining Superior Follow-Up Rates in a Longitudinal Study: Experiences from the College Life Study. Int J Mult Res Approaches (2012) 1.27

Marijuana exposure opportunity and initiation during college: parent and peer influences. Prev Sci (2012) 1.20

Opportunities to use drugs and stages of drug involvement outside the United States: Evidence from the Republic of Chile. Drug Alcohol Depend (2009) 1.13

College students' use of cocaine: results from a longitudinal study. Addict Behav (2010) 1.06

Exposure opportunity as a mechanism linking youth marijuana use to hallucinogen use. Drug Alcohol Depend (2002) 1.02

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Initiation into drug abuse: the pathway from being offered drugs to trying cannabis and progression to intravenous drug abuse. Scand J Soc Med (1993) 1.01

Childhood predictors of first chance to use and use of cannabis by young adulthood. Drug Alcohol Depend (2011) 0.94

Cross-national comparisons of sex differences in opportunities to use alcohol or drugs, and the transitions to use. Subst Use Misuse (2011) 0.93

Drug use opportunities as opportunities for drug use prevention: Bogotá, Colombia a case in point. Drug Alcohol Depend (2011) 0.92

The Rural Context of Illicit Substance Offers: A Study of Appalachian Rural Adolescents. J Adolesc Res (2012) 0.92

Who receives cannabis use offers: A general population study of adolescents. Drug Alcohol Depend (2015) 0.89

The power of the proposition: frequency of marijuana offers, parental knowledge, and adolescent marijuana use. Drug Alcohol Depend (2014) 0.85

Marijuana use trajectories during college predict health outcomes nine years post-matriculation. Drug Alcohol Depend (2015) 0.81

Do college students improve their grades by using prescription stimulants nonmedically? Addict Behav (2016) 0.80

Complexities in understanding and addressing the serious public health issues related to the nonmedical use of prescription drugs. Addict Behav (2016) 0.75