<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0185-3325</journal-id>
<journal-title><![CDATA[Salud mental]]></journal-title>
<abbrev-journal-title><![CDATA[Salud Ment]]></abbrev-journal-title>
<issn>0185-3325</issn>
<publisher>
<publisher-name><![CDATA[Instituto Nacional de Psiquiatría Ramón de la Fuente Muñiz]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0185-33252017000600291</article-id>
<article-id pub-id-type="doi">10.17711/sm.0185-3325.2017.037</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Early cannabis use and its relation to the development of psychiatric disorders: a review]]></article-title>
<article-title xml:lang="es"><![CDATA[Consumo precoz de cannabis y su relación con el desarrollo de trastornos psiquiátricos: una revisión narrativa]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Roncero]]></surname>
<given-names><![CDATA[Carlos]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Palma-Álvarez]]></surname>
<given-names><![CDATA[Raúl Felipe]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
<xref ref-type="aff" rid="A a"/>
<xref ref-type="aff" rid="A4"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Barrau]]></surname>
<given-names><![CDATA[Víctor]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
<xref ref-type="aff" rid="A a"/>
<xref ref-type="aff" rid="A5"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Urbano]]></surname>
<given-names><![CDATA[Neide]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Martínez-Luna]]></surname>
<given-names><![CDATA[Nieves]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
<xref ref-type="aff" rid="A a"/>
<xref ref-type="aff" rid="A4"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ortiz-Medina]]></surname>
<given-names><![CDATA[María Bettina]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Daigre]]></surname>
<given-names><![CDATA[Constanza]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad de Salamanca Complejo Asistencial Universitario de Salamanca Servicio de Psiquiatría]]></institution>
<addr-line><![CDATA[Salamanca ]]></addr-line>
<country>Spain</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Hospital Universitario Vall d&#8217;Hebrón Servicio de Psiquiatría ]]></institution>
<addr-line><![CDATA[Barcelona ]]></addr-line>
<country>Spain</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Autónoma de Barcelona Departamento de Psiquiatría ]]></institution>
<addr-line><![CDATA[Barcelona ]]></addr-line>
<country>Spain</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Hospital Universitario Vall d&#8217;Hebrón Sección de Adiciones y Patología Dual ]]></institution>
<addr-line><![CDATA[Barcelona ]]></addr-line>
<country>Spain</country>
</aff>
<aff id="Af5">
<institution><![CDATA[,Institut de Recerca Hospital Vall d&#8217;Hebrón  ]]></institution>
<addr-line><![CDATA[Barcelona ]]></addr-line>
<country>Spain</country>
</aff>
<aff id="Af6">
<institution><![CDATA[,Hospital Dona Estefânia Centro Hospitalar de Lisboa Central Área de Psiquiatria da Infância e da Adolescência]]></institution>
<addr-line><![CDATA[Lisboa ]]></addr-line>
<country>Portugal</country>
</aff>
<aff id="Af7">
<institution><![CDATA[,Hospital Mare de Deu de la Mercè Área de Psicogeriatría ]]></institution>
<addr-line><![CDATA[Barcelona ]]></addr-line>
<country>Spain</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2017</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2017</year>
</pub-date>
<volume>40</volume>
<numero>6</numero>
<fpage>291</fpage>
<lpage>298</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0185-33252017000600291&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0185-33252017000600291&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0185-33252017000600291&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract:  Background: Cannabis is the most widely used illegal drug in the world. Both an early cannabis use onset and the amount used contribute to the risk of suffering mental disorders in adulthood.  Objective: Review longitudinal studies conducted on adolescents associating early cannabis use with the subsequent occurrence of mental disorders.  Method: A search was conducted in PubMed until December 2016, focusing on longitudinal researches and prioritizing studies that clearly distinguished between an early and late onset of cannabis use. To achieve the objective, the word &#8220;cannabis&#8221; was used in combination with the main psychiatric diseases. A manual search of articles that appeared in the references was also conducted.  Results: Fifteen studies met the inclusion criteria, but only five studies discriminated clearly between early and late onset of cannabis use. An association was found between early onset of cannabis use and mental disorders, particularly psychosis. The information regarding affective and anxiety disorders is more controversial.  Discussion and conclusion: Early onset of cannabis use is associated with mental disorders, especially psychosis. Prevention plans for cannabis use in adolescents should be developed in order to decrease the risk of mental disorders.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen:  Antecedentes: El cannabis es la droga ilegal más consumida en todo el mundo. Tanto el inicio de su consumo a una edad temprana como la cantidad consumida aumentan el riesgo de padecer enfermedades mentales en la vida adulta.  Objetivo: Revisión narrativa de artículos longitudinales realizados en adolescentes donde se relacionaron el uso temprano de cannabis con la posterior aparición de alteraciones psicopatológicas.  Método: Se realizó una búsqueda en la base de datos de PubMed hasta diciembre de 2016. Se priorizaron los estudios longitudinales en adolescentes que establecieron diferencias entre inicio temprano versus tardío de uso de cannabis. Para ello se utilizó la palabra cannabis en combinación con las principales enfermedades psiquiátricas. Además, se llevó a cabo una búsqueda manual de artículos que aparecían en las referencias.  Resultados: Se encontraron 15 estudios longitudinales en adolescentes que relacionaban el uso de cannabis con alteraciones mentales; sólo cinco de ellos hacían una diferenciación clara entre inicio temprano versus tardío. Se encontró que hay una asociación entre el consumo de cannabis en edades tempranas con la presencia de alteraciones psicopatológicas, especialmente de trastornos psicóticos. En cuanto a los trastornos afectivos y el consumo temprano de cannabis, la asociación es algo más controvertida.  Discusión y conclusión: El uso de cannabis en edades tempranas podría llevar a presentar posteriormente trastornos mentales, sobre todo psicosis. Identificar el consumo de drogas en adolescentes y adultos jóvenes es una estrategia que puede influir en el establecimiento de planes de prevención para evitar y/o disminuir el riesgo de desarrollo de patología mental.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Adolescence]]></kwd>
<kwd lng="en"><![CDATA[cannabis]]></kwd>
<kwd lng="en"><![CDATA[early drug use]]></kwd>
<kwd lng="en"><![CDATA[psychosis]]></kwd>
<kwd lng="en"><![CDATA[psychiatric disorders]]></kwd>
<kwd lng="es"><![CDATA[Adolescencia]]></kwd>
<kwd lng="es"><![CDATA[cannabis]]></kwd>
<kwd lng="es"><![CDATA[consumo precoz de cannabis]]></kwd>
<kwd lng="es"><![CDATA[psicosis]]></kwd>
<kwd lng="es"><![CDATA[trastornos psiquiátricos]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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