Answer:
Part carbon part water I am poison to the fishes. Many falsely claim my name I am the pause that refreshes.
I cause involuntary movements in your vehicle
I am a path between high natural masses; remove the first letter to get a path between man-made masses.
I shoot but never kills
I am a creature with a βtightβ name.
What do you purposefully put lots of in and on your body, but run away from when you encounter it outside?