I'm allergic to certain brands of washing powder. One wash of my clothes and I puff up like a lobster. Caused untold issue's when working in the US and using laundry services.
Every day dozens of people end up hospitalized due to finding they're allergic to something the first time the breathe, touch or ingest that something.
Sad stuff that they've had to go back pre tpd to dig up that one person to point at.
As I said in another thread, people have been hospitalized for decade's after trying smoking for the first time only to find they're deadly allergic to one or more of the thousands of active ingredients.
Vaping is a smoking cessation tool. If you've smoked then there's very little chance your going to be allergic to eliquid with it's handful of ingredients unless you already know you have allergies.
Like anything we try for the first time from washing powder to penicillin to snickers bar's. There's a possibility of an allergic reaction but vaping isn't aimed at people to try for fun, Again, it's a bloody smoking cessation tool.