I've taken breaks from vaping for two reasons.
1.) In the beginning, I got a 901 kit. It worked well in terms of vapor, TH and flavor but it really sucked in terms of battery life, even with spare batts. I couldn't last a whole day of vaping, so to get my fix I needed analogs.
2.) I smoked analogs. I have very different feelings from vaping and smoking. Both can satisfy my addiction urge and I actally prefer vaping for that. But sometimes, notably when I'm stressed, I need a cigarette. Unfortunately, I have very little impule control so when I have cigarettes around, I smoke them. So when I get stressed, my 0 analogs a week jumps to about a pack a day. Then I'll kick myself for spending the money and come back to vaping.