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Study say marijuana no gateway drug

Science Blog

Monday 04 Dec 2006

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Marijuana is not a “gateway” drug that predicts or eventually leads to
substance abuse, suggests a 12-year University of Pittsburgh study.
Moreover, the study’s findings call into question the long-held belief
that has shaped prevention efforts and governmental policy for six
decades and caused many a parent to panic upon discovering a bag of pot
in their child’s bedroom.

The Pitt researchers tracked 214 boys beginning at ages 10-12, all of
whom eventually used either legal or illegal drugs. When the boys
reached age 22, they were categorized into three groups: those who used
only alcohol or tobacco, those who started with alcohol and tobacco and
then used marijuana (gateway sequence) and those who used marijuana
prior to alcohol or tobacco (reverse sequence).

Nearly a quarter of the study population who used both legal and illegal
drugs at some point – 28 boys – exhibited the reverse pattern of using
marijuana prior to alcohol or tobacco, and those individuals were no
more likely to develop a substance use disorder than those who followed
the traditional succession of alcohol and tobacco before illegal drugs,
according to the study, which appears in this month’s issue of the
American Journal of Psychiatry.

“The gateway progression may be the most common pattern, but it’s
certainly not the only order of drug use,” said Ralph E. Tarter, Ph.D.,
professor of pharmaceutical sciences at the University of Pittsburgh
School of Pharmacy and lead author of the study. “In fact, the reverse
pattern is just as accurate for predicting who might be at risk for
developing a drug dependence disorder.”

In addition to determining whether the gateway hypothesis was a better
predictor of substance abuse than competing theories, the investigators
sought to identify characteristics that distinguished users in the
gateway sequence from those who took the reverse path. Out of the 35
variables they examined, only three emerged to be differentiating
factors: Reverse pattern users were more likely to have lived in poor
physical neighborhood environments, had more exposure to drugs in their
neighborhoods and had less parental involvement as young children. Most
importantly, a general inclination for deviance from sanctioned
behaviors, which can become evident early in childhood, was strongly
associated with all illicit drug use, whether it came in the gateway
sequence, or the reverse.

While the gateway theory posits that each type of drug is associated
with certain specific risk factors that cause the use of subsequent
drugs, such as cigarettes or alcohol leading to marijuana, this study’s
findings indicate that environmental aspects have stronger influence on
which type of substance is used. That is, if it’s easier for a teen to
get his hands on marijuana than beer, then he’ll be more likely to smoke
pot. This evidence supports what’s known as the common liability model,
an emerging theory that states the likelihood that someone will
transition to the use of illegal drugs is determined not by the
preceding use of a particular drug but instead by the user’s individual
tendencies and environmental circumstances.

“The emphasis on the drugs themselves, rather than other, more important
factors that shape a person’s behavior, has been detrimental to drug
policy and prevention programs,” Dr. Tarter said. “To become more
effective in our efforts to fight drug abuse, we should devote more
attention to interventions that address these issues, particularly to
parenting skills that shape the child’s behavior as well as peer and
neighborhood environments.”

Indeed, according to the study, interventions focusing on behavior
modification may be more effective prevention tactics than current
anti-drug initiatives. For example, providing guidance to parents –
particularly those in high-risk neighborhoods – on how to boost their
caregiving skills and foster bonding with their children, could have a
measurable effect on a child’s likelihood to smoke marijuana. Also,
early identification of children who exhibit antisocial tendencies could
allow for interventions before drug use even begins.

Although this research has significant implications for drug abuse
prevention approaches, Dr. Tarter notes that the study has some
limitations. First, as only male behaviors were studied, further
investigation should explore if the results apply to women as well.
Also, the examination of behaviors in phases beyond alcohol and
marijuana consumption in the gateway series will be necessary.

From University of Pittsburgh Medical Center http://www.upmc.edu/
http://www.scienceblog.com/cms/study-say-marijuana-no-gateway-drug-12116.html

 

 

 

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