Why are opioids so addictive?

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Most of the time, it’s from fentanyl.”,”imageUrl”:”//cdn.cnn.com/cnnnext/dam/assets/181211182939-opioids-addiction-overdose-orig-nws-00003207-large-169.jpg”,”title”:”Why are opioids so addictive?”,”videoCMSUrl”:”/video/data/3.0/video/health/2018/12/11/opioids-addiction-overdose-orig-nws.cnn/index.xml”,”videoLeafUrl”:”/videos/health/2018/12/11/opioids-addiction-overdose-orig-nws.cnn”,”videoId”:”health/2018/12/11/opioids-addiction-overdose-orig-nws.cnn”,”videoUrl”:”/videos/health/2018/12/11/opioids-addiction-overdose-orig-nws.cnn/video/playlists/addiction-battles/”,”surrogateKey”:”video_2AC34F4F-3D96-4C9F-5D1A-9F947A6A7BE5″},{“descriptionPlainText”:”Homelessness and the opioid epidemic are plaguing San Francisco streets. 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owl.$element.find(‘.cd.cd–active’) : $carouselContentItems.find(‘.cd.cd–active’);$owlPrevItem.removeClass(‘cd–active’);$owlPrevItem.find(‘.media__over-text’).remove();$owlPrevItem.find(‘.media__icon’).show();$owlFirstItem = CNN.Utils.exists(owl._items) ? jQuery(owl._items[showIndex]) : $carouselContentItems.eq(showIndex);$owlFirstItem.find(‘.cd’).addClass(‘cd–active’);$owlFirstItem.find(‘.media a:first-child’).append(‘

Now Playing

‘);if (Modernizr && !Modernizr.phone) {$owlFirstItem.find(‘.media__icon’).hide();}}CNN.Videx.Metadata.init({dateCreated: videocardContents.dateCreated,descriptionText: videocardContents.descriptionText,duration: videocardContents.duration,sourceLink: videocardContents.sourceLink,sourceName: videocardContents.sourceName,title: videocardContents.headlineText},{videoCollectionDivId: ‘cn-1fgc4sq’,videoDescriptionDivId: ‘js-video_description-1fgc4sq’,videoDurationDivId: ‘js-video_duration-1fgc4sq’,videoTitleDivId: ‘js-leaf-video_headline-1fgc4sq’,videoSourceDivId: ‘js-video_sourceName-1fgc4sq’});if (CNN.Utils.exists(videocardContents.showName)) {if (CNN.Utils.exists(videocardContents.showUrl)) {showDetailsSpanContent = ‘‘ + videocardContents.showName + ‘ | ‘;} else {showDetailsSpanContent = videocardContents.showName + ‘ | ‘;}}fastdom.measure(function getShowInfo() {var $show = jQuery(‘.metadata__show’),$isShowDetailsSpanExists = $show.find(‘span’).hasClass(‘metadata–show__name’),$showName = jQuery(‘.metadata–show__name’);fastdom.mutate(function updateShowInfo() {if (!$isShowDetailsSpanExists) {$show.prepend(‘

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