If your aware of how your body feels I would think you could be clued a stroke of sorts was starting or happening. I hope cause there are good treatments if you catch it in time. Trigger smells or phantom odors may mean you gotta good sniffer...burnt electrical connections are crazy subtle hints that electrical connections are overheated.

Phantosmia is one thing however the first signs of a stroke include:

Sudden numbness or weakness in any part of your body
Trouble expressing yourself with language, including the inability to speak or understand what's being said to you
Difficulty walking
Sudden onset of any kind of confusion
A sudden and painful headache

Wow!

Burned toast triggers you?

Messages through the nose reach the deepest part of the brain. Mother's milk possibly the first sensation of the olfactory system??

That would be disorienting! What a way to start the day.

I occasionally have bouts of smelling phantom cigarette smoke in a house where no one has ever smoked, and will start looking for other symptoms of a tumor. The side effects of aging suck.