GTS happens when farmers come into direct contact with wet tobacco
Indeed, heterocyclic amines in tobacco smoke require activation by CYP1A2 and NAT2 (Voutsinas et al., 2013)
Newman AH, Blaylock BL, Nader MA, Bergman J, Sibley DR, Skolnick P (2012)

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This means that vaping is prohibited in most indoor public places and places of employment where traditional smoking is also banned