This episode of Kurzgesagt — In a Nutshell takes a “fair look at some of the best counter arguments for legalization and see how they hold up in review.” If you’re on the fence about marijuana legalization, I highly recommend the watch.

The idea of this video is to specifically reach people who are against decriminalization and to take them seriously. There is an abundance of pro arguments and content on the internet – and while they are correct, they tend to marginalize the negative effects of smocking weed. So we wanted to show that even if you think that nobody should ever smoke, you still can support a public policy approach that protects more people, than by keeping cannabis illegal. Sometimes it is annoying to hear things that don’t match what we already think. Researching our videos in depth often does the same thing to us. In this case we decided that was more important to reach people, who would not have watched another video that is obviously pro liberalization.

Some of the sources used in the video:

Argument 1: Marijuana Causes Psychosis

Studies point to a correlation between THC and psychosis
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Ian Hamilton, Addiction, 2017

THC levels have increased in the last few decades while CBD levels have decreased
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ElSohly MA et al, Biological Psychiatry, 2016

Possible benefits of CBD for psychosis treatment
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Study: Correlation between frequency of marijuana consumption and risk of psychosis
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Bourque et al, Journal of Child Psychology and Psychiatry, 2017

Article by the University of York: Risk of psychosis from marijuana use small compared to the number of total users
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Study: rising rates of marijuana use cause no increase in psychosis patients
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Frisher M et al, Schizophrenia Research, 2009

Increased risk of psychosis in marijuana smokers who are already at clinical high-risk for psychosis
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Vadhan, Nepal P. et al, Psychiatry Research, 2017

Increased tendency for consumption of hard liquor during the US prohibition era
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Argument 2: Marijuana as a gateway drug

Study: association between marijuana use and use of other illicit drugs
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Secades-Villa et al, The international journal on drug policy, 2015

Teenagers who smoke are 80 times more likely to use illegal drugs
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Lai S et al, Journal of Addictive Diseases, 2000

Increased risk of excessive alcohol and drug use for smoking teenagers
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The National Center on Addiction and Substance Abuse at Columbia University, 2007

Study: risk factors of incident onset of use, abuse and dependence of marijuana
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Kirsten von Sydow et al, Drug and Alcohol Dependence, 2002

Decriminalization of possession and consumption of all illicit substances in Portugal
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Decrease in continuity rates of use
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Argument 3: Marijuana is addictive and damages organs

Statistics: doubling of marijuana treatment admissions in Europe, 2003-2014
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Statistics: Increased number of people who seek treatment for marijuana related problems
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Statistics: marijuana addiction
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Study: Correlation between THC levels and first-time admissions to drug treatment in the Netherlands
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Freeman et al, Psychological Medicine, 2018

Study: health problems related to marijuana consumption
//go.nature.com/2tN6Scm
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Pacher et al, Nature Reviews Cardiology, 2017
Barbara A Yankey et al, European Journal of Preventive Cardiology, 2017

Study: no health risks related to marijuana use
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Meier MH et al, JAMA Psychiatry, 2016

Study: Effects of marijuana on the adolescent brain
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Batalla A et al, PLoS ONE, 2013

Studies: lowered IQ in teenagers using marijuana
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Newer studies: influence of general drug use on brain development and IQ
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Meier MH et al, Addiction, 2018

Risk of dependence on alcohol and tobacco
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Lachenmeier DW et al, Scientific Reports, 2015

Study: the effects of tobacco use on health
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Study: the effects of alcohol consumption on health
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