Many years ago, I took the conscious decision not to believe in all this superstion nonsense. On occasion, I went out of my way to walk under a ladder. I walked over the cracks in pavements; if I were throwing away a mirror I would deliberately break it; if no one was looking I would direct a (gentle) kick at a black cat; etc. etc.
And the result of all this? Well, I'm still here. I can honestly say nothing untoward has ever happened to me as a result of all the above. Touch wood.