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@Bruben and welcome to the planet.
tbh i think comparing cigs to vape is pointless and almost impossible to answer.
think of it this way, vape ya tits off and enjoy the feeling of not being a smoker of cancer sticks anymore and at least 95% healthier after the first few weeks.
yes there are going to be some long term smokers that have already sucummed to various heart, lung cancer issues where the damage is sadly to far gone so they will never be 100% fitter again and be able to run a marathon.
but for the majority, after the first two-three weeks of stopping smoking and going through the detox process the lungs can start healing themselves as they are not getting all the dangerous toxins that are in cigs.
even me, i smoked for 37 years and gave up overnight just over 6 years ago with a vape. my body is fekked with arthritis but my chest and lungs are clear and look like a never smoker.
i can averag 40-50ml a day at 3mg and i have no wheezing in the mornings since giving up the cigs.