Come now Dutch, one has to live a little and the body needs both salt and fat.
Wee bag of Tayto never killed a man, in your case it will be the 30+ years of cigarettes and alcohol abuse.
Crisps can elevate any sandwich from ordinary to enjoyable, there is a very good reason why cafes and other establishments put a few on the plate.
Have gay crisps if it makes you feel better, or superior.
I confess a soft spot for a packet of Smiths salt and shake, but they definitely have no place in a cheese and onion sandwich. A cheese sandwich is transformed into a thing of joy and wonder by the addition of crisps, but once onion has been added to the 'wich, the crisps need to be served very much on the side.
I don't make the rules. Don't blame me.
Not a fan, personally, but I have no objection to another chap adding pickle to hsi cheese sandwich. I reiterate, of course, that if onion has been paired with the cheese, no further addition is permissable. I include mayonnaise, mustard and lettuce in this embargo.
Cheese and onion. That is the sandwich. Cheese and onion. Nothing more.