What is the nicotine concentration in my STLTH pods?

Four strength options are available:

1) 0mg/mL - Nicotine Free

2) 20mg/ml - Total of 40mg in a 2ml pod.

3) Bold 35 (20mg/mL) - Total of 40mg in a 2ml pod.

4) Bold 50 (20mg/mL) - Total of 40mg in a 2ml pod.