
Inclusion Criteria
a) At least 21 years of age
b) Generally healthy
c) Regular use of both e-cigarettes and regular cigarettes
d) Access to a smartphone, tablet, or computer with functioning camera, adequate data, and/or internet access
Exclusion Criteria
a) Currently pregnant, breastfeeding, trying to become pregnant, or unwilling to agree to use adequate protection to avoid pregnancy
b) Plans to quit use of either e-cigarettes and/or cigarettes, or all tobacco products in the next 45 days
c) Previous adverse reaction when using vaping device or e-liquid