Nicotine levels in the pod products and urine cotinine concentrations detected in 22 surveyed patients (aged 13–21 years) who reported pods use within 7 days prior to the clinic visit
| Brand name of pod system | Number of patients who reported using the pod product (single brand/in combination with other pod products) | Nicotine concentration in a pod (mg/mL) | Nicotine yields in 10 puffs (mg) | Type of nicotine salt | Median urinary cotinine concentration in exclusive users (ng/mL) |
| Juul | 10/6 | 56.2 | 0.83 | Benzoate | 135.1 |
| Bo | 3/6 | 37.9 | 0.85 | Levulinate | 508.4 |
| Phix | 2/3 | 48.0 | 0.77 | Benzoate | 906.4 |
| Sourin (refilled with BlowSauce e-liquid) | 0/2 | 21.8 | 0.26 | Benzoate | N/A* |
*All users of Sourin brand reported using multiple products.