Its a small amount, but every drop is significant when were talking about vape juice with a nicotine strength of 50 mg/ml
Li, Z., Li, R., Li, Q., Zhou, J
For some context, organizations like the World Health Organization have advised on the regulation of tobacco products, but expiration dates arent mandatory in many places, leaving it to consumers to inspect and decide
Randomization Simple individual randomization was done by serially numbered, opaque, and sealed envelopes (SNOSEs) with a card indicating the group (either intervention or control) inside
We asked, "Where do teens usually buy e-cigarettes around here?" A teen pointed us across the street