Well, what happened was they weakened the system in order to increase convenience.

The bad news is, of course, it weakens the whole system.

"The coup has further weakened the system as we knew it," he said.

Historians, however, agree that the lack of parties weakened the political system.

Heavy drinking is also thought to weaken the immune system.

This medicine may weaken your immune system while you are taking it.

The treatment had, however, weakened his immune system, and he died from pneumonia.

Have another health problem or stress that weakens the immune system.

It can weaken your immune system, so that you have a harder time fighting off disease.

Here's another reason to give up smoking - it weakens your immune system.