Geeker, my suggestion (from years of being overweight and years of "diets" I may have a better suggestion) is if you have stayed with the same eliquid company, change companies. That company MAY have a specific ingredient that is hindering your weight loss. Also DO NOT under eat!!!! My experience with weight loss has shown me that if I eat too little I will gain weight. Also some foods (could be milk products, nuts even seasonings) will hinder weight loss. My body is so weird that I have to make sure I eat 3 meals a day along with a snack or two, be almost sedentary and make sure I avoid to much of certain foods (not because of allergies but because they slow my metabolism). As said by other posters here exercise may be the problem, my husband is always moving for 12 hours a day in all kinds of weather and ways and still he will gain weight if he doesn't keep an eye out for trigger foods. Also do not underestimate STRESS, even the effort put into counting calories may induce stress. Stress comes in may forms and most of the time most people don't even realize that they are stressed. The thought of no more cigs could and will put your body in stress and you don't know it.
If it was me I would start with the eliquid, change brands for 2 weeks and see if that helps then move to other things....
try all pg if you can (you could be allergic and the body's way of coping is weight gain)
try all vg
try abstaining for one particular food group
ALL OF THE ABOVE FOR TWO WEEK TRIALS, two weeks should let you know if it is a trigger
Also be sure to find ways to reward yourself, the simple act of a reward raises your endorphins and helps with all forms of stress and weight loss.
Good luck, I hope for the best for you and your health.