Answer:
I fly away as soon as you set me loose. People around you may slowly move away once they sense my presence.
I am flora not fauna. I am foliage not trees. I am shrubbery not grass.
I can fly but I have no wings. I can cry but I have no eyes. Wherever I go, darkness follows me. What am I?
I drift forever with the current and flows to your everyday life. I make living easy but I am good at killing people too.
In buckles or lace I help set the pace. The farther you go the thinner I grow.
Give it food and it will live, give it water and it will die.