Lots of people smoke and vape, there's no law that says it's a pure binary choice. Getting down on yourself for picking up a ciggie here and there is the absolute worst thing you could do: it'll stress you and make you feel like a failure, and thus make you more inclined to smoke more and vape less.
Do what you need, when you need. As long as you're making an honest effort to vape more than you smoke, or at least smoke less than you did, you're a winner and should be proud of that success. Focus on what you achieve, not what target you miss.
As others said, work out why you smoked/smoke and see if it's changeable. If you need to up your nic content, rock on; if you're not loving vaping, look into different juices that might be more appealing or even a different mod that might get more out of your flavours; if it's just a "because it's there" see if you can make it less there (I'm sure if you asked friends and family to try and not smoke around you or offer you one because you want to quit, they'll try and make it harder to bum one or be tempted by them); if it's a recent stress increase, accept that it's temporary and believe you'll drop the habit again when things are calmer, or see if you can find more productive ways of handling stress, or again look into higher nic options even to keep as an emergency Bad Day stash.
Do what is right for you. There is no fail here.
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