I'll preface by stating that I am a physician. There was a study released by the NIH regarding the health hazards of amorphous silica. I have not seen any human studies regarding this topic, but animal inhalation studies demonstrated partially reversible inflammation and granuloma formation after exposure to amorphous silica. While there was no progressive fibrosis seen in these animal models, there have been a small number of reported cases of silicosis (in humans) due to amorphous silica exposure. Remember, these cases were industry related, and the likelihood of this happening as a result of vaping is extremely small. Silicosis (or any pneumoconiosis for that matter) is a result of chronic exposure to inordinately large amounts of silica (or other foreign substance). As long as you keep your wicks wet, you'll be fine; even the dry hits that we all get every now and then won't hurt. So sit back, relax, and enjoy vaping with your ELA!!!