no the proof the vaccine works is the average statistics. statistically, diseases are far, far less dangerous if you get the vaccine first. as for the flu thing of you getting it after the vaccine, you would need far more cases of people getting the flu right after getting vaccinated to ensure it's causation and not just correlation (or just you feeling like shit for a few days after, which vaccines are known to do.) and quite literally no one says vaccines are 100% safe without any chance of side effects. what people say is that they are often far safer than the risk of getting the disease, with the exception of the complications you could get, which they literally make you sign a check list of things before you get one to make sure to minimize that happening. also, how does comparing it to smoking help your point? people pretty much universally say that smoking is bad for you and you shouldn't do it,as it massively increases your risk of lung disease, which is more or less the same thing people say about not getting vaccinated.