Never heard of death by tomatoes before but I suppose you can be allergic to anything.
The whole gluten free thing was a great example with everybody saying they were allergic but the majority of them just joining the no gluten fad. Of your a celiac fair enough but most people are not allergic but just afraid of everthing.
I'm not that old but in school we didn't have one person with allergies to food and yet now everybody is being so careful with everything and about 50 different requirements for the students. I honestly don't believe even half of them are allergic to what they say they are.