What Am I Riddles

Question: What is it you like to kill, but actually kills you?

Question: I am your most powerful weapon; I come before your eyes.. I help you seek the truth, yet I often give you lies. What am I?

Question: I am something, a lot of people don't like me, including you,but I'm called upon anytime one is injured. I like playing with pregnant women, I'm a 5 letter word, and if my last letter is put before first letter, I become a name of a country, WHAT AM I? IF U GET THIS, U'RE INDEED A GENIUS.

Question: I am almost nonexistent through sorrow, yet am frequent through happiness. I have no contact, yet I am contagious. What am I?

Question: I can easily impale meat, And also can withstand the heat of a charcoal burning fire.