Hi, I smoked some meth and my vision went strange briefly. It was like everything was flickering or I had triple vision. Ive never experienced this before. My concern is that my city currently has a fentanyl and car-fentanyl crisis. We are urged to use with extreme caution because most street drugs are being laced. Im wondering if this side effect I experienced could have anything to do with it being laced or if this is completely unrelated... if it is unrelated why did this happen? Just a quick background. Im a 23 year old female who has been for the most part in recovery and abstinent from all drugs for the past 4 years with the exception of very brief relapses (like less then 3 days at a time) here and there, I have a tendency to relapse 2-5 times a year and when I do slip its not for long so I have a very low tolerance.