No doubt your point is valid. Just like allergies to MSG and gluten, but studies are indicating that e-cigs are similar to cigs in terms of health consequences. Time will tell.
You seem to be saying that gluten allergies are imagined... not sure if you're being serious or facetious, but gluten allergy is real and no joke. I realize that going "gluten free" is a fad, it's cool, it's even considered some sort of "diet" but the REAL gluten allergy, celiac disease, is not psychological, it's a serious allergy and it sucks. It causes pain, discomfort, and digestive problems like constipation and diarrhea. Unchecked it can cause extreme malnutrition over time. Gluten damages the small intestines of people with celiac disease eventually causing a loss of ability to uptake nutrients.
My wife, daughter, and sister in law all have been clinically diagnosed with it and it is definitely not merely psychological. People don't realize it, but gluten is in all kinds of food and eliminating it from your diet really sucks.
Say goodbye to "real" bread of all kinds, pizza, pasta, cake, cookies, pie, beer, root beer, and TONS of other foods you would never imagine would contain it. Sure they make gluten-free alternatives; you like bread? Press some dirt into the shape of a slice of bread, that's what gluten free bread tastes like. I've tried it.
My wife reads every label and has to be very careful when eating out to avoid even a trace, because since she has switched to a completely gluten-free diet (about 8 years ago) she is more sensitive to it than ever.
She practically lives on eggs...