Perhaps it is easier to understand when you look at the immediate symptoms associated with quitting, as reported by the American Heart Association
You will see the design you made through the hole, probably zig-zag lines
Public Health Service released "Smoking and Health: Report of the Advisory Committee to the Surgeon General of the Public Health Service." Over the decades, the reports of the Surgeon General have alerted the nation to health risks of smoking and changed the issues from consumer choice to scientific study and research that investigates factors linked to smoking
A more recent human study detected significantly higher levels of metabolites of hazardous compounds including benzene, ethylene oxide, acrylonitrile, acrolein and acrylamide in the urine of adolescent dual users ( e-cigarettes and conventional tobacco consumers) than in adolescent e-cigarette -only users (Table 1) [9]
Greenland S, Pearl J, Robins JM
Liquids must be carried in 100 ml or smaller bottles and placed in a transparent resealable bag meeting airport security standards