Cannabis Use Discussion

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Science

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  • Start by reading this article, which gives a simplified overview of the attached research article. https://www.forbes.com/sites/alicegwalton/2014/10/...
  • Open the attached research article and read the sections titled, "Why are we concerned about recreational cannabis use," and "Adverse health effects of chronic cannabis use" (this is a very long section and you don't need to read the entire thing. SKIP: cannabis dependence, The psychosocial consequences of adolescent cannabis use, and Cannabis use and mental health). Take a look at Table 1 to see how strong the author feels the evidence is for various effects on health.
  • Answer the following questions:
    1. Why is it challenging to accurately measure the effect of regular cannabis use on health?
    2. Overall, how does cannabis use affect users' cognitive ability and IQ? From Table 1, how strong is the evidence? Does the evidence prove causation or is it a correlation? Does the age the user starts or the length of time spent smoking marijuana make a difference in the longterm effects?
    3. What effect does marijuana have on the structure of the brain? From Table 1, how strong is the evidence? Does the evidence prove causation or is it a correlation?
    4. What effect does smoking marijuana have on the respiratory system? From Table 1, how strong is the evidence? Does the evidence prove causation or is it a correlation?
    5. Is there enough evidence in this article to draw the conclusion that there is a good possibility that marijuana can negatively impact certain aspects of health?

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bs_bs_banner MONOGRAPH doi:10.1111/add.12703 What has research over the past two decades revealed about the adverse health effects of recreational cannabis use? Wayne Hall1,2,3 The University of Queensland Centre for Youth Substance Abuse Research and The UQ Centre for Clinical Research, Herston, Australia,1 The National Addiction Centre, Kings College London, London, UK2 and National Drug and Alcohol Research Centre, University of New South Wales, New South Wales, Australia3 ABSTRACT Aims To examine changes in the evidence on the adverse health effects of cannabis since 1993. Methods A comparison of the evidence in 1993 with the evidence and interpretation of the same health outcomes in 2013. Results Research in the past 20 years has shown that driving while cannabis-impaired approximately doubles car crash risk and that around one in 10 regular cannabis users develop dependence. Regular cannabis use in adolescence approximately doubles the risks of early school-leaving and of cognitive impairment and psychoses in adulthood. Regular cannabis use in adolescence is also associated strongly with the use of other illicit drugs. These associations persist after controlling for plausible confounding variables in longitudinal studies. This suggests that cannabis use is a contributory cause of these outcomes but some researchers still argue that these relationships are explained by shared causes or risk factors. Cannabis smoking probably increases cardiovascular disease risk in middle-aged adults but its effects on respiratory function and respiratory cancer remain unclear, because most cannabis smokers have smoked or still smoke tobacco. Conclusions The epidemiological literature in the past 20 years shows that cannabis use increases the risk of accidents and can produce dependence, and that there are consistent associations between regular cannabis use and poor psychosocial outcomes and mental health in adulthood. Keywords Cannabis, dependence, drug-related harms, epidemiology, health risks, mental health. Correspondence to: Wayne Hall, The University of Queensland Centre for Youth Substance Abuse Research, Herston 4006, Australia. E-mail: w.hall@ uq.edu.au Submitted 6 April 2014; initial review completed 21 May 2014; final version accepted 4 August 2014 WHY ARE WE CONCERNED ABOUT RECREATIONAL CANNABIS USE? During the past half-century, recreational cannabis use has become almost as common as tobacco use among adolescents and young adults. Since its use was first reported more than 40 years ago in the United States, recreational cannabis use has spread globally to other developed countries and, more recently, low- and middleincome countries [1,2]. The effects sought by cannabis users—euphoria and increased sociability—seem to be produced primarily by delta-9-tetrahydrocannabinol (THC) [3]. These effects may be modulated by cannabidiol (CBD), a non- psychoactive cannabinoid found in many cannabis products [3]. THC content is highest in the flowering tops of the female cannabis plant. During the past 30 years the THC content of cannabis has increased in the United States from
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