Table 5 Concentration of nickel (Ni) in µg/g of e-liquid for the purchased cigalike ENDS cartridges.

From: Cigalike electronic nicotine delivery systems e-liquids contain variable levels of metals

Brand

Flavor

Purchases

Nickel µg/g

1

2

3

4

Average

blu

Classic Tobacco

0.37 (0.02)a,b

0.43 (0.02)

0.36 (0.01)

0.75 (0.02)

0.48 (0.2)

Carolina Bold

0.27 (0.02)

0.7 (0.4)

1.5 (0.3)

N/Ac

0.8 (0.6)

Magnificent Menthol

0.63 (0.04)

0.65 (0.3)

BLQd

0.66 (0.1)

0.65 (0.14)

Cherry Crush

0.29 (0.01)

N/A

0.18 (*)

0.44 (0.03)

0.34 (0.1)

MarkTen

Classic

0.28 (0.01)

0.27 (*)

0.26 (0.01)

0.15 (0.01)

0.24 (0.05)

Menthol

BLQ

BLQ

BLQ

BLQ

UTD e

Summer Fusion

0.52 (*)

0.28 (0.01)

0.31 (0.03)

BLQ

0.33 (0.09)

Winter Mint

0.18 (0.0)

BLQ

BLQ

0.32 (0.2)

0.25 (0.1)

Vuse Solo

Original

0.44 (0.01)

0.47 (0.0)

0.42 (0.1)

0.36 (0.1)

0.42 (0.08)

Menthol

0.39 (0.1)

0.40 (0.02)

0.21 (*)

0.23 (0.03)

0.33 (0.1)

Mint

0.66 (0.04)

0.56 (0.01)

0.32 (*)

N/A

0.56 (0.1)

Berry

0.62 (0.05)

0.39 (0.01)

0.60 (*)

0.42 (0.01)

0.48 (0.1)

Chai

0.73 (0.06)

0.47 (0.0)

0.52 (0.01)

0.73 (0.2)

0.62 (0.2)

Crema

0.69 (0.02)

0.96 (0.02)

0.64 (0.04)

1.06 (0.02)

0.82 (0.2)

Vuse Vibe

Original

BLQ

BLQ

0.13 (0.01)

0.54 (0.08)

0.38 (0.2)

Menthol

N/A

BLQ

N/A

2.4 (0.5)

2.4 (0.5)

Nectar

0.11 (*)

BLQ

BLQ

2.2 (1)

1.7 (1)

Melon

0.11 (0.0)

0.51 (*)

6.2 (2)

11 (5)

5.1 (5)

Blank

Propylene Glycol

BLQ

Glycerol

BLQ

  1. All samples for which the mean copper concentration is equal to or exceeds the USP limits for Ni in inhaled drug products (0.5 μg/g) are bolded.
  2. aConcentrations are reported as mean (standard deviation), n = 3 unless otherwise noted by (*).
  3. bBold indicates the mean metal concentration exceeded the USP limit for an inhaled product.
  4. cN/A indicates the brand and flavor combination was unavailable during the purchase attempt.
  5. dBelow lower limit of quantitation (BLQ).
  6. eUnable to determine (UTD).
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