qualm

n. pang of the conscience; regret, sorrow; doubt, misgiving; sudden feeling of weakness and/or nausea

Qualm.co.uk is a small poetry magazine that has been published online biannually since September 2003. Contributors to it - of previously unpublished poems - include Glyn Maxwell, Jack Beeching, Les Murray, Robert Crawford, Jamie McKendrick, Anne Stevenson, Peter Reading, Harry Clifton, Terese Svoboda, Simon Carnell, Hugo Williams, Brian Waltham, Stephen Knight and Medbh McGuckian.
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Noun
1. uneasiness about the fitness of an action
(synonym) scruple, misgiving
(hypernym) anxiety
2. a mild state of nausea
(synonym) queasiness, squeamishness
(hypernym) nausea, sickness

n. smoke, vapor given off by burning material

v. smoke, smoke tobacco; give off smoke; give off vapor

(n.)
Sickness; disease; pestilence; death.
  

(n.)
Especially, a sudden sensation of nausea.
  

(n.)
A sudden attack of illness, faintness, or pain; an agony.
  

(n.)
A prick or scruple of conscience; uneasiness of conscience; compunction.