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But NZ has dropped the ball on e-cigarettes by separating its regulatory framework from other tobacco products

Metal/Metalloid Levels in Electronic Cigarette Liquids, Aerosols, and Human Biosamples: A Systematic Review

Taken as a whole, this study appears to provide ample evidence that some of the negative health effects associated with smoking may be partially mediated or enhanced by changes in oral microbiota

I don't know if this would be considered a UL, though, because it's really there

The pollutants contained in cigarette smoke include nicotine, polycyclic aromatic hydrocarbons, heavy metals, and various volatile organic compounds