Should there be a comma after the word "smoking" ?
"Other factors may affect nitric oxide values such as age, sex, atopy, and cigarette smoking so a normal level in an older adult would not rule out asthma."
There should be a comma before "such as" and a comma after "smoking" because this is a parenthetical phrase which needs to be set off by a pair of commas or other punctuation.
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There should be a comma before "such as" and a comma after "smoking" because this is a parenthetical phrase which needs to be set off by a pair of commas or other punctuation.