With e-liquid, you need to start thinking in ml's, not number of cigarettes. We do not know for sure how much nicotine we receive in our bloodstream from
vaping. Ane study seems to indicate we receive less nicotine through
vaping than from analogs.
I have read that an average ex-smoker may consume 2-5ml of liquid per day. Use that as your benchmark.That figure is dependent upon how much you vape during the day and the device you are using. To be clearer, if you vape a DSE601 e-pipe, it will burn through tons of liquid. If you vape pretty much all day long, you will burn through a lot of liquid.
I smoked 20-30 cigs a day. When I first started vaping I would easily go through 4-6 cartridges or 4-6ml of liquid each day. You will vape much more heavily the first 30-60 days and it will level out after that.