Commodity
Thanks tar sands

Thick as fog but light as air. You never see me coming. I cloud your senses and grip your life. My ways are truly cunning. I fill a room in no time flat. I can cause folks to die. My brother and sister are solid and wet. Question: What am I? I am what goes up but seldom comes down. I am needed but hated. I am useful in multiple ways. I somewhat hold the future. Question: What am I? See answers