How does the vaccination lower your immunity?

As for the "it won't happen to me", that naivety of beliefs is potentially dangerous.

Asthma by it very pathology increases the the potential for contraction of droplet and airborne infections and longer or more severe physiological responses. The mere fact that thus far you have been spared is not guarantee if future protection.

You only have to sit in the waiting room of your local GP or Childrens Hospital Emergency to find natures petrie dish working full throttle.