Most people think oral cancers happen to only smokers! But did u know sometimes the 1st sign is just a mouth ulcer that doesn't heal? #cancer Why does e liquid turn brown? And How To Stop It. EDGE Vaping Is It Bad to Smoke a Brown Cart? Understanding the Risks and Effects Is this a problem with my pod? My juice keeps going dark really quickly and it tastes horrible. I know it can go brown through oxidation but I've read that shouldn't affect