You know, now that you explain it all that way, maybe my thinking has been mislead and targeting the wrong thing altogether? - I mean, I just ‘assumed’, by simply associating the heartburn with the hotter ingredients, when it could have been more so to do with the spices, etc.? … TBH, I never thought about it too much, but like you stated, I too have never enjoyed when foods cause my mouth or throat to burn (excessively) so pretty much have avoided over-doing it with either spicy or hot foods. But I do have Horseradish at the house, and I do occasionally use it with no issues. (Though I also don’t use much at once either) Mostly to just add some flavor, or such as when I make things like Cocktail Sauce, etc.
But if it’s like you say, and Wasabi does help with sinuses, then boy am I’m in! I’ve always had bad sinus issues, and who knows, I may just become a big fan? The Almonds do have a snap to them, and I didn’t mind eating some yesterday. Will have to see after a little time, since I seem to be sticking to Habanero and Smokehouse presently. Not to mention Salt & Vinegar. But no matter which ones I do choose to eat, I do limit them since they are pretty much 75% fat & easy to over-do. (For some folks)