Ragan clarified this misconception by saying, There are things like tar and carbon monoxide in the vapes, and tar is exactly what it sounds like: the residue of combust particulate matter made by the burning of tobacco. The tar is toxic, and it damages the lungs, and it can ruin your teeth by rotting and blackening them, Ragan continued
Third, the smoking prevalence was also obtained from national health survey data with a representative sample in 1989, which allowed for an induction period of 20 years
Descriptive Statistics: Baseline demographic and clinical characteristics of the participants were described according to the study groups: the test group (gradual cessation) and the control group (abrupt cessation)
Kallings LV, Olsson SJG, Ekblom , Ekblom-Bak E, Brjesson M