Note: A negative result does not guarantee a drug-free sampleit may indicate levels are below the cut-off threshold
We assessed for associations of ever smoked (1 = current or former smoking on most or all days, 0 = never smoking on most or all days), cigarettes per day (present if they are currently smoking or past if they are no longer smoking), and smoking duration (age at the time of data collection minus the year they started smoking if they are currently smoking, and the year they stopped smoking minus the year they started smoking if they are no longer smoking) with gray matter and white matter controlling for age, sex, ethnicity, income, college degree, alcoholic drinks per month, body mass index, waist-hip ratio, diastolic and systolic blood pressure, and x , y , z position in the scanner
With so many brands in circulation and the rapidly evolving product market, it can be difficult for physicians and users to identify what brand and/or pods that they have been using
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