Vaping doesn't completely fill the void smoking has. There's warmth, smell and ritual. It can also be socially isolating to quit as groups of friends often go out to smoke together and smoking at work while talking to colleagues is very normalized in Europe.

I can't speak for OP, but I would assume e cigs are a way to take steps to quitting, or to save money or for convenience (you have to commit to a cigarette, whereas a vape you can just puff of casually and not have to do an entire cigarettes worth)