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. Author manuscript; available in PMC: 2020 Mar 1.
Published in final edited form as: Environ Res. 2018 Dec 16;170:351–358. doi: 10.1016/j.envres.2018.12.027

Fig 3: Concentrations of cotinine, n-formylnornicotine, and NNA in terrycloth towels from the vape shop field site.

Fig 3:

Terrycloth placed outside (A, E, I), on the chalkboard (B, F, J), in the lounge (C, G, K), and on the display case (D, H, L) inside the vape shop had detectable and quantifiable levels of nicotine related alkaloids and a TSNA, NNA. The scale for Figure A-D is 0–1000 ng/gram, E-H is 0–2000 ng/gram, and I-L is 0–80 ng/gram.