how to pass tobacco screening a Nicotine Test Guidelines for Interpreting Cotinine Levels:

To investigate the sources of heterogeneity, we performed subgroup analyses based on different criteria, including country income categories (HICs versus LMICs), policy implementation time (pre-2008 versus post-2008, following the introduction of the World Health Organizations MPOWER package in 2008) and policy evaluation timing relative to its introduction (within 15 months versus more than 16 months, using the median value)

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It has a harder draw giving much cooler vapour due to it having to travel the full length of the super long tube