Dust probably is better for you than spam... and tastes better too...
Canned dust, eh? Could sell well if marketed properly.
Thinking about the joke about being so old he/she farts dust, I dunno I'd recommend it for old people, though.
Could bring about fines from the AQCC [Air Quality Control Commission] for excess dust emissions
Not so sure I'd buy it... thinking about the persistent tickle in the throat it'd likely cause.