Health effects of exposure to second and third hand marijuana smoke: a systematic review CMAJ Open Even if an employee only uses marijuana on the weekends, it could still show up on their workplace sponsored drug screen the following week or later. According to some estimates, traces of THC Secondhand exposure from vaping marijuana: Concentrations, emissions, and exposures determined using both research grade and low cost monitors ScienceDirect Prevalence of vaping, vaping associated short term symptoms of respiratory and cardiovascular morbidities, and factors associated with the initiation of vaping among young adults in Kuwait Secondhand Smoke & Drug Tests: Can You Fail? (2026 Data) PrestoDoctor How Long Does Weed Stay in Your System? 2025 Guide & Detox