



{"id":16475,"date":"2026-08-14T16:45:53","date_gmt":"2026-08-14T14:45:53","guid":{"rendered":"https:\/\/largeur.com\/?p=16475"},"modified":"2026-08-07T10:51:42","modified_gmt":"2026-08-07T08:51:42","slug":"sequelles","status":"publish","type":"post","link":"https:\/\/largeur.com\/?p=16475","title":{"rendered":"Du cannabis \u00e0 la schizophr\u00e9nie"},"content":{"rendered":"<p>Les effets du cannabis sur la sant\u00e9 mentale sont aujourd\u2019hui bien document\u00e9s.<strong>\u00a0<\/strong>Une \u00e9tude, men\u00e9e en 2024, montre qu\u2019une consommation r\u00e9guli\u00e8re avant 14 ans peut augmenter le risque de d\u00e9velopper une psychose (voir encadr\u00e9). \u00abLa schizophr\u00e9nie n\u2019est pas une maladie homog\u00e8ne, li\u00e9e \u00e0 un seul m\u00e9canisme neurobiologique; elle est d\u00e9finie par la pr\u00e9sence de certains sympt\u00f4mes qui peuvent \u00e9merger dans le contexte de diverses anomalies du fonctionnement c\u00e9r\u00e9bral\u00bb, explique le professeur Philippe Conus, chef du Service de psychiatrie du CHUV. Il s\u2019agit d\u2019une forme de psychose, un groupe de troubles qui alt\u00e8rent le contact avec la r\u00e9alit\u00e9 et dont l\u2019expression varie d\u2019une personne \u00e0 l\u2019autre. La schizophr\u00e9nie touche 1 \u00e0 2% de la population.<\/p>\n<p>Le trouble se caract\u00e9rise par des sympt\u00f4mes dits \u00abpositifs\u00bb, comme des id\u00e9es d\u00e9lirantes, des hallucinations \u2013 souvent auditives \u2013 et une d\u00e9sorganisation de la pens\u00e9e. \u00c0 cela s\u2019ajoutent des sympt\u00f4mes dits \u00abn\u00e9gatifs\u00bb, comme la perte d\u2019\u00e9lan vital, le retrait social ou des difficult\u00e9s \u00e0 \u00e9prouver du plaisir. La maladie s\u2019accompagne aussi de troubles \u00abcognitifs\u00bb, qui sont souvent les plus invalidants. \u00abLa cognition nous permet de recevoir les signaux, de les organiser et de leur donner du sens. Lorsqu\u2019elle est atteinte, les interactions sociales et la capacit\u00e9 \u00e0 r\u00e9aliser des t\u00e2ches complexes en p\u00e2tissent fortement\u00bb, pr\u00e9cise le sp\u00e9cialiste.<\/p>\n<blockquote>\n<h5><strong><span style=\"font-size: 12pt;\">\u00abDans une grande partie des cas, une prise en charge br\u00e8ve est suffisante. Il faut une d\u00e9mocratisation des consultations, pour comprendre d\u2019o\u00f9 vient le trouble et agir rapidement: c\u2019est important.\u00bb Philippe Conus, chef du Service de psychiatrie du CHUV.\u00a0<\/span><\/strong><\/h5>\n<\/blockquote>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-16458\" src=\"https:\/\/largeur.com\/wp-content\/uploads\/2026\/07\/In-Vivo_Cannabis_Schizo-300x199.jpg\" alt=\"\" width=\"300\" height=\"199\" srcset=\"https:\/\/largeur.com\/wp-content\/uploads\/2026\/07\/In-Vivo_Cannabis_Schizo-300x199.jpg 300w, https:\/\/largeur.com\/wp-content\/uploads\/2026\/07\/In-Vivo_Cannabis_Schizo.jpg 468w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/p>\n<p><strong>Le cannabis, un facteur d\u00e9clenchant<\/strong><\/p>\n<p>En elle-m\u00eame, la consommation de cannabis peut provoquer des hallucinations, une d\u00e9personnalisation ou des \u00abbad trips\u00bb \u2013 mais pas chez tout le monde. \u00abNous ne sommes pas tous \u00e9gaux face aux effets du\u00a0 cannabis. Certains y surr\u00e9agissent, tandis que d\u2019autres ressentent moins d\u2019effets.\u00bb<\/p>\n<p>Le lien entre cannabis et schizophr\u00e9nie est aujourd\u2019hui \u00e9tabli. \u00abLe cannabis a clairement un effet aggravant: il augmente ou maintient les sympt\u00f4mes chez les personnes atteintes de psychose, d\u00e9taille Philippe Conus. Mais il peut aussi jouer un r\u00f4le en amont. Pour quelqu\u2019un-e qui a un risque (par exemple familial) de d\u00e9velopper une schizophr\u00e9nie, la consommation de cannabis peut \u00eatre le facteur d\u00e9clenchant.\u00bb<\/p>\n<p>Enfin, des \u00e9tudes de population montrent que les jeunes qui commencent \u00e0 consommer entre 12 et 14 ans voient leur risque de d\u00e9velopper un trouble psychotique multipli\u00e9 jusqu\u2019\u00e0 quatre. \u00c0 l\u2019adolescence, le cerveau se r\u00e9organise intens\u00e9ment. \u00ab\u00c0 cet \u00e2ge, le cerveau a une certaine flexibilit\u00e9 dans les connexions possibles; l\u2019augmentation de la dopamine ou l\u2019effet du cannabis peut nuire au bon d\u00e9roulement de cette importante r\u00e9organisation et contribuer \u00e0 l\u2019\u00e9mergence d\u2019un trouble psychotique.\u00bb Le cannabis peut donc perturber un \u00e9quilibre encore fragile, en construction. \u00abAvant 18 ans, l\u2019effet causal entre la consommation et la schizophr\u00e9nie appara\u00eet nettement; il ne se retrouve plus de la m\u00eame mani\u00e8re chez ceux qui commencent \u00e0 fumer plus tard.\u00bb<\/p>\n<p>Au-del\u00e0 de l\u2019\u00e2ge, d\u2019autres facteurs entrent en jeu. La composante g\u00e9n\u00e9tique est \u00e9galement importante, ainsi que l\u2019exposition \u00e0 des traumatismes, de la violence, des abus sexuels et physiques ou encore l\u2019abandon constituent aussi des facteurs de risque. Ces \u00e9l\u00e9ments peuvent constituer un terrain de vuln\u00e9rabilit\u00e9 sur lequel le cannabis peut agir comme un facteur d\u00e9clenchant.<\/p>\n<hr \/>\n<blockquote><p><strong>\u00abJe ne pensais pas que \u00e7a pouvait casser \u00e0 ce point\u00bb Propos recueillis par Benjamin Meier<\/strong><\/p><\/blockquote>\n<p class=\"testimonial-teaser\">\u00c0 la suite d\u2019une consommation r\u00e9guli\u00e8re de cannabis, Antoine*, 36 ans, a d\u00e9velopp\u00e9 un \u00e9pisode psychotique. Pris en charge au CHUV, il a progressivement retrouv\u00e9 un \u00e9quilibre.<\/p>\n<p>\u00abJ\u2019ai commenc\u00e9 \u00e0 fumer petit \u00e0 petit, vers la vingtaine. En colocation, c\u2019est devenu une habitude quotidienne: un joint en rentrant, parfois plus.\u00bb Pendant ses \u00e9tudes en Lettres et Humanit\u00e9s num\u00e9riques, tout se passe bien. Mais avec le Covid, l\u2019isolement s\u2019installe. \u00abJ\u2019ai commenc\u00e9 \u00e0 fumer de plus en plus. Ma sant\u00e9 psychique a d\u00e9gringol\u00e9.\u00bb Il traverse une d\u00e9pression, consulte plusieurs sp\u00e9cialistes, sans parvenir \u00e0 arr\u00eater de fumer.<\/p>\n<p>La situation se fragilise. En arr\u00eat maladie, il se retrouve au ch\u00f4mage. \u00abJe suis devenu tr\u00e8s anxieux, d\u00e9motiv\u00e9 et stress\u00e9.\u00bb En 2024, il subit une d\u00e9compensation. \u00abMon cerveau ne distinguait plus la r\u00e9alit\u00e9 de mes d\u00e9lires. Je pensais \u00eatre espionn\u00e9, en danger et qu\u2019on essayait de communiquer avec moi par t\u00e9l\u00e9phone. L\u2019autocorrection sur mon t\u00e9l\u00e9phone me faisait penser \u00e0 des messages cach\u00e9s.\u00bb<\/p>\n<p>La reconstruction prendra du temps. \u00abRevenir sur pieds m\u2019a pris une ann\u00e9e et demie.\u00bb Au CHUV, les traitements m\u00e9dicamenteux sont ajust\u00e9s progressivement. Mais c\u2019est surtout l\u2019accompagnement humain qui a fait la diff\u00e9rence. \u00abDes rendez-vous r\u00e9guliers, la possibilit\u00e9 de parler, un soutien global.\u00bb D\u2019un naturel anxieux, il \u00e9voque une \u00abangoisse existentielle\u00bb li\u00e9e au fait de vivre seul, au ch\u00f4mage et \u00e0 son manque d\u2019activit\u00e9. \u00abEntendre \u201c\u00e7a ira mieux\u201d m\u2019a beaucoup soulag\u00e9.\u00bb Son passage \u00e0 l\u2019Institut ma\u00efeutique \u2013 un lieu de soins et d\u2019activit\u00e9s pour adolescent-es et jeunes adultes souffrant de troubles psychiques \u2013 lui a aussi permis de retrouver un rythme.<\/p>\n<p>Avec le recul, il reconna\u00eet avoir \u00e9t\u00e9 conscient des risques. \u00abMais comme pour d\u2019autres addictions, c\u2019est irrationnel. Je ne pensais pas que \u00e7a pouvait casser \u00e0 ce point. Aujourd\u2019hui, j\u2019ai l\u2019esprit moins brumeux, plus d\u2019\u00e9nergie. Ma vie a repris des couleurs.\u00bb Apr\u00e8s avoir refum\u00e9 de mani\u00e8re occasionnelle, il a totalement arr\u00eat\u00e9 la consommation de cannabis. \u00abJ\u2019avais un probl\u00e8me moral avec le fait de recommencer. Maintenant j\u2019en ai fini avec \u00e7a et tant mieux!\u00bb<\/p>\n<hr \/>\n<p><strong>Rep\u00e9rer les signaux d\u2019alerte<\/strong><br \/>\nIl est possible de d\u00e9celer certains \u00e9tats mentaux \u00e0 risques. \u00abIl peut s\u2019agir de jeunes qui ont des sympt\u00f4mes l\u00e9gers comme de la bizarrerie de perception, des ralentissements de la cognition, de l\u2019anxi\u00e9t\u00e9, de la d\u00e9pression\u00bb. Dans de tels contextes, des programmes sp\u00e9cialis\u00e9s proposent des soins ad\u00e9quats et pr\u00e9ventifs. \u00abDes approches psychologiques ou neuroprotectrices \u2013 comme la prescription d\u2019om\u00e9ga 3- sont \u00e0 l\u2019\u00e9tude et semblent permettre de freiner ou emp\u00eacher le d\u00e9veloppement d\u2019une pathologie.\u00bb<\/p>\n<p>Pour Philippe Conus, la sensibilisation des jeunes \u00e0 l\u2019\u00e9gard des risques du cannabis reste insuffisante. Il plaide pour un message simple, non culpabilisant mais qui est en ad\u00e9quation avec la r\u00e9alit\u00e9: \u00e9viter toute consommation pr\u00e9coce, \u00eatre attentif et attentive aux r\u00e9actions inhabituelles comme la parano\u00efa ou le mal-\u00eatre, par exemple, et consulter si la consommation devient un besoin. La th\u00e9rapie psychiatrique est particuli\u00e8rement efficace face \u00e0 cette probl\u00e9matique.\u00a0 \u00abDans une grande partie des cas, une prise en charge br\u00e8ve est suffisante. En consultant rapidement, on trouve plus facilement des pistes de r\u00e9solution du probl\u00e8me.\u00a0Il faut une d\u00e9mocratisation des consultations, pour comprendre d\u2019o\u00f9 vient le trouble et agir rapidement: c\u2019est important. Sinon, la situation peut s\u2019aggraver et n\u00e9cessiter des traitements plus longs et plus complexes. Le cerveau est un organe complexe. Environ la moiti\u00e9 de la population passe, au cours de sa vie, par une phase de trouble et de sant\u00e9 mentale. Plus vite on s\u2019en occupe, mieux on comprend les causes et plus grandes sont les chances de gu\u00e9rir.\u00bb<\/p>\n<p>&nbsp;<\/p>\n<p>*Pr\u00e9nom d&#8217;emprunt<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Fumer du cannabis peut favoriser le d\u00e9veloppement de la schizophr\u00e9nie, surtout s\u2019il est consomm\u00e9 durant l\u2019adolescence.<\/p>\n","protected":false},"author":20340,"featured_media":16458,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5],"tags":[1299],"class_list":["post-16475","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-latitude","tag-paru-dans-in-vivo","latitude"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.0.1 - aioseo.com -->\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta name=\"author\" content=\"Benjamin Meier\"\/>\n\t<meta name=\"keywords\" content=\"paru dans in vivo,latitudes\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/largeur.com\/?p=16475\" \/>\n\t<meta name=\"generator\" content=\"All in One SEO (AIOSEO) 5.0.0.1\" \/>\n\t\t<meta property=\"og:locale\" content=\"fr_FR\" \/>\n\t\t<meta property=\"og:site_name\" content=\"Largeur.com |\" \/>\n\t\t<meta property=\"og:type\" content=\"article\" \/>\n\t\t<meta property=\"og:title\" content=\"Du cannabis \u00e0 la schizophr\u00e9nie | Largeur.com\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/largeur.com\/?p=16475\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2026-08-14T14:45:53+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2026-08-07T08:51:42+00:00\" \/>\n\t\t<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n\t\t<meta name=\"twitter:title\" content=\"Du cannabis \u00e0 la schizophr\u00e9nie | Largeur.com\" \/>\n\t\t<script type=\"application\/ld+json\" class=\"aioseo-schema\">\n\t\t\t{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/largeur.com\\\/?p=16475#article\",\"name\":\"Du cannabis \\u00e0 la schizophr\\u00e9nie | Largeur.com\",\"headline\":\"Du cannabis \\u00e0 la schizophr\\u00e9nie\",\"author\":{\"@id\":\"https:\\\/\\\/largeur.com\\\/?author=20340#author\"},\"publisher\":{\"@id\":\"https:\\\/\\\/largeur.com\\\/#organization\"},\"image\":{\"@type\":\"ImageObject\",\"url\":\"https:\\\/\\\/largeur.com\\\/wp-content\\\/uploads\\\/2026\\\/07\\\/In-Vivo_Cannabis_Schizo.jpg\",\"width\":468,\"height\":311,\"caption\":\"Man smokes a joint. 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