Table 3.
Caffeine Concentrations Found in Coffee, Tea, Chocolate, and Energy Drink Flavored E-liquids, as well as E-liquid Products Labeled as Caffeinated
| Flavor | Average (μg/g) | SD (μg/g) | CV (%) |
|---|---|---|---|
| Chocolate | |||
| Niquid Chocolate | 10.8 | 0.6 | 5.2 |
| Niquid Mint Chocolate Chip | <LOD | ||
| JuicyVapor Chocolate | 3.7 | 0.2 | 4.7 |
| Hotvapes Mousse au Chocolat | <LOD | ||
| Azure Vaping Chocolate Caramel | 3.3 | 0.1 | 3.4 |
| iVape Chocolate | <LOD | ||
| Chocolate coffee combined | |||
| Mister-E-Liquid G.T.F.O. | <LOD | ||
| JuicyVapor Choffee | 9.6 | 0.4 | 4.0 |
| Tea | |||
| Niquid Summertime Tea | 27.7 | 0.9 | 3.2 |
| Mister-E-Liquid Chai Tea | <LOD | ||
| JuicyVapor Ginger Peach Green Tea | 33.1 | 0.9 | 2.8 |
| Coffee | |||
| Texas Select Vapor Southern Moccachino | <LOD | ||
| Texas Select Vapor Vanilla Frappe | <LOD | ||
| VaporCast Cappuccino | 347 | 13.2 | 3.8 |
| Mister-E-Liquid Espresso | <LOD | ||
| JuicyVapor Coffee | <LOD | ||
| JuicyVapor French Vanilla Coffee | <LOD | ||
| Hotvapes Kona Coffee | <LOD | ||
| Hotvapes Café Filbert | <LOD | ||
| Azure Vaping Coffee n′ Cream | 139 | 4.3 | 3.1 |
| iVape Cappucino | <LOD | ||
| Kalamazoo Vapor KVS Coffee | <LOD | ||
| Kalamazoo Vapor Java Scotch | <LOD | ||
| Blu Java Jolt | 242 | 10.7 | 4.4 |
| Premium Coffee 0 mg | 3.9 | 0.2 | 4.9 |
| eSmoke Morning Coffee 0 mg | 161 | 4.7 | 2.9 |
| eSmoke Morning Coffee 11 mg | 173 | 2.3 | 1.3 |
| eSmoke Morning Coffee 16 mg | 172 | 8.2 | 4.8 |
| Energy drink | |||
| VaporCast Energy Drink | <LOD | ||
| JuicyVapor An1mal | <LOD | ||
| Kalamazoo Vapor Beast | <LOD | ||
| Energy boost/caffeinated products | |||
| NEWhere Energy Vape with Taurine | 831 | 49.7 | 6.0 |
| Vapour Labs Energy Shisha | 31.5 | 0.9 | 3.0 |
| StlVapor Cola | 1150 | 64.4 | 5.6 |
| StlVapor Power | 759 | 38.1 | 5.0 |
| StlVapor Aktiv | 1200 | 68.8 | 5.7 |
| High Voltage Resistor | 137 | 3.4 | 2.5 |
| Xtreme Vapour Babylon Energy Kick | <LOD | ||
| City Vapes Night Crawler Energy | 1690 | 110 | 6.5 |
| City Vapes Side Kick Energy | 2020 | 133 | 6.6 |
| VaporBoost Stamina (0.30% caffeine) | 1690 | 104 | 6.2 |
| Vaporrenu Burley (80 mg caffeine) | 3740 | 199 | 5.3 |
| NutriCigs Cherry Energy | 9290 | 309 | 3.3 |
| Bootleg Vapors Coffee (200 mg caffeine) | 703 | 46.8 | 6.7 |
CV = coefficient of variation. Each sample was analyzed in triplicate (N = 3). Limit of detection (LOD) is 0.04 μg/g).