Cryptic crossword clue
Therefore strange mist causes sickness

The most common and most likely answer to this crossword clue is the 8 letter word ERGOTISM

I've seen this crossword clue in Independent
E
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Buddy explains!

The straight part
We know that "sickness" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case sickness = ergotism.
The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.
This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.

What does ERGOTISM mean?

ERGOTISM noun
  1. The effect of long-term ergot poisoning, traditionally due to the ingestion of the alkaloids produced by the Claviceps purpurea fungus which infects rye and other cereals, and more recently by the action of a number of ergoline-based drugs.
ERGOTISM noun
  1. A logical deduction.

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