While

Avoid the indiscriminate use of this word for and, but, and although. Many writers use it frequently as a substitute for and or but, either from a mere desire to vary the connective, or from uncertainty which of the two connectives is the more appropriate. In this use it is best replaced by a semicolon.

Poor: The office and salesrooms are on the ground floor, while the rest of the building is devoted to manufacturing.
Better: The office and salesrooms are on the ground floor; the rest of the building is devoted to manufacturing.

From: William Strunk, Jr., The Elements of Style, 1918.