Table 1.

EDS Items and Associated Factor Loadings

	EDS Version
Items	22-Item	8-Item	4-Item
I find myself reaching for my e-cigarette without thinking about it.	0.75	0.77	0.76
I drop everything to go out and buy e-cigarettes or e-juice.	0.73	0.73	0.77
I vape more before going into a situation where vaping is not allowed.	0.73	0.74	0.71
When I haven’t been able to vape for a few hours, the craving gets intolerable.	0.88	0.88	0.89
When I’m really craving an e-cigarette, it feels like I’m in the grip of some unknown force that I cannot control.	0.77	0.76
I crave vaping at certain times of day.	0.76	0.77
My urges to vape keep getting stronger if I don’t vape.	0.90	0.90
After not vaping for a while, I need to vape in order to avoid feeling any discomfort.	0.88	0.87
My desire to vape seems overpowering.	0.83
Cravings for an e-cigarette make it difficult for me to quit.	0.87
It is hard to ignore urges to vape.	0.91
When I go without vaping for a few hours, I experience craving.	0.88
I frequently crave e-cigarettes/vaping.	0.87
The idea of not vaping causes me stress.	0.84
When I run out of e-cigarettes or e-juice, I find it almost unbearable.	0.84
I get a real gnawing hunger for an e-cigarette when l haven’t vaped in a while.	0.87
I vape even when I am so ill that I am in bed most of the day.	0.63
When I go too long without vaping I feel impatient.	0.87
It is hard for me to go without vaping for a whole day.	0.77
When I go too long without vaping, I get strong urges that are hard to get rid of.	0.89
Vaping is a large part of my daily life.	0.61
I am tempted to vape when I realize I haven’t vaped for a while.	0.83