No.
It’s no respecter of persons.
It can strike anyone, of any background, and regardless of lifestyle or personality traits. Don’t beat yourself up about what was “wrong with you”, or what you did wrong, to get MS.
I think smoking is one of very few lifestyle factors that has been shown to increase risk, BUT that is not a cause in itself, as lots of people smoke who don’t get MS, and conversely, lots of non-smokers still get it. So if you smoke, or have smoked in the past, it’s not quite as simple as saying: “that’s what did it”. There’s no guarantee that not smoking would have stopped you getting MS.
It’s now known beyond doubt that there’s a genetic element, but there’s no one gene that always causes MS. There are several dozen that have been identified as risk factors, but even someone who had all of them would not be certain to get MS. They’d just be at higher risk. Most of the genes discovered so far have to do with the functioning of the immune system, which lends weight to the case that it IS an auto-immune disease. Some of them have also been linked to Vitamin D, which strengthens the case for that, as well. We might have some sort of defect that means we can’t produce enough vitamin D, or can’t process it properly.
I certainly believe there’s a genetic element in my case, as I found out after diagnosis that I was not the first in the family. The relative who had it before me was quite distant - my grandmother’s sister - but I still believe it’s not just coincidence, and we probably both had enough “dodgy” genes to be at higher risk. That means other members of the family probably also inherited a higher-than-average risk, but it doesn’t mean they are destined to get MS.
Seriously, don’t torment yourself with this stuff - there’s nothing you could have done. NICE guidelines actually say your neuro is supposed to reassure you at the time of diagnosis that you didn’t cause it, as many patients are plagued by questions of whether they somehow brought it on themselves. There’s absolutely no evidence it’s a lifestyle disease, but many neuros forget to mention that, leaving patients struggling with feelings of guilt and “what ifs”.
As a wise poster here has been known to put it: “Sh*t happens!” That, in a nutshell, is why you have MS.
Tina