So, I'm allergic to pot, to where I get anaphylaxis. This past year, I've had a few sudden reactions that have sent me to the hospital, from neighbors smoking close enough to the air intake, and from my teenaged niece that lives with me (who has thought that simply spraying enough perfume to cover it would make it ok). I was hoping to find a sensor that could detect it, because if I wait to when I can smell it then it is too late to stop a reaction.

Anyone able to point me in a direction?