Using the SMOKO VAPE POD as a reference, 1ml of e-liquid per day works out to 1 VAPE POD refill every 2 days
and any part of that plant, including the seeds thereof and all derivatives, extracts, cannabinoids, isomers , acids, salts, and salts of isomers, whether growing or not, with a delta-9 tetrahydrocannabinol concentration of not more than 0.3 percent on a dry weight basis." This product is legal according to federal law and most state laws
Electronic Cigarette Use Among Youth and Adolescents Oral health professionals are on the frontline of helping youth avoid or quit e-cigarette use
But these are typically labeled as such, so if you're not into tobacco, they're easy to avoid