It's all placebo..

"Reality is an illusion"-Albert Einstein

If you believe you will get ill, if you give that form to power, if you sow that seed in the fertile fields of creation then so too will you reap it. Personally I have't gotten sick in many many years, and do not give power to it. God said do not trust the evil ways and give them power, and so I listen to those words of wisdom. I do not take any shots either.