These numbers are measured under controlled laboratory methods
Briefly, cigarette smoke from one cigarette was collected from the side of the combustion zone with neither puffing nor passing through a filter, and bubbled into 10 mL of sterile PBS in a 50 mL centrifuge tube at minimum speed using a suction pump (Tokyo M.I., Tokyo, Japan, Cat# M20)
That being said, these Zig Zag tubies I have found to be of great quality both in taste and build quality
PLoS Genet 6(8):e1001051 Li Y et al (2010) Genetic variants and risk of lung cancer in never smokers: a genome-wide association study
They gloss over that distinction
The science is now in: e-cigarette users are much likelier to be diagnosed with COVID-19 and to experience symptoms. His letter cited a new study published Tuesday in the Journal of Adolescent Health that found adolescents and young adults aged 13 to 24 who smoke e-cigarettes are five times more likely than non-vapers to be diagnosed with COVID-19