The adverb for continually was used in Greek of a hacking cough. Paul was speaking of maintaining continuous fellowship with God as much as possible in the midst of daily living in which concentration is frequently broken. - Constable
 Constable, T. L. (1985). 1 Thessalonians. In J. F. Walvoord & R. B. Zuck (Eds.), The Bible Knowledge Commentary: An Exposition of the Scriptures (Vol. 2, pp. 708–709). Wheaton, IL: Victor Books.