None are built for 24/7 use or even all day.
i use a digital vapor brothers knock off works well one broke after being dropped by me quite a few times. as far as leaving it on thats a good way to start a fire. mine turns off automatically after 45 minutes or so a good feature i think.the 12o'clock setting works well for me also. I guess i should turn it off and on each time i use it.
I've left my vapor tower on for days at a time . . . still works greatNone are built for 24/7 use or even all day.
Yah I wish I could drive my vape, my car is out of commission right now . . .I don't think you can draw a valid comparison between a car and a vap.