Not everybody quits smoking cigarettes when they start vaping. Some quit later down the road and some just never quit. It's all just a matter of choice. Now, having said that... if you are looking to replace cigarette smoking with vaping there may be a few things to consider. Cigarette smoking is not the same as vaping. So you're not going to get the exact same feel. It doesn't feel the same from the moment you pick it up to the moment you exhale the vaper. Not to our bodies, not to our brains. You could be expecting to get the same all around sensation and missing that when your vaping experience is different. (I vape a 50/50 unflavored 12 mg juice via a Vamo. Nothing about it feels the same as lighting up a cig. I don't get the same throat hit or immediate brain feel but I'm definitely getting enough nic. In fact maybe a tad more than I need cause after a few minutes, I get the jittery feeling if I vape more than a few hits at a time.)
There are additional ingredients in a cigarette that cause the nic to cross the brain barrier within 10 seconds of taking that first puff. From what I understand, there isn't the same thing in e juice so it takes just a little longer to get the same effect. Not sure how much longer, but it's not the almost instant gratification we would get when we lit up. Increasing your nic level or changing the way you vape might make a difference. We absorb the bulk of our nic through the mucus membrane (mouth, nose, throat) not through the lungs. So drawing the vape in and holding it in your mouth before exhaling it through your nose might help?
It might also just be that you have to give yourself time to adjust. If you find yourself reaching for that cigarette (and your vaping intention is to NOT smoke), ask yourself, is it habit or is it need? If you just have a few vapes and you feel the cig need, make yourself wait a few minutes or so before lighting up. Could be your brains hasn't had a chance to get it's nic fix yet. But, if you light up a cigarette, don't beat yourself up. It happens and doesn't mean you failed. Good luck and remember, you're not alone!