Joe Thorn’s recent tweet reminded of this bit of advice for preachers from the Prince of Preachers, Charles Spurgeon:
When you have done preaching take care of your throat by never wrapping it up tightly. From personal experience I venture with some diffidence to give this piece of advice. If any of you possess delightfully warm woollen comforters, with which there may be associated the most tender remembrances of mother or sister, treasure them — treasure them in the bottom of your trunk, but do not expose them to any vulgar use by wrapping them round your necks. If any brother wants to die of influenza let him wear a warm scarf round his neck, and then one of these nights he will forget it, and catch such a cold as will last him the rest of his natural life.
You seldom see a sailor wrap his neck up. No, he always keeps it bare and exposed, and has a turn-down collar, and if he has a tie at all, it is but a small one loosely tied, so that the wind can blow all round his neck. In this philosophy I am a firm believer, having never deviated from it for these fourteen years, and having before that time been frequently troubled with colds, but very seldom since.
If you feel that you want something else, why, then grow your beards! A habit most natural, scriptural, manly, and beneficial. One of our brethren, now present, has for years found this of great service. He was compelled to leave England on account of the loss of his voice, but he has become as strong as Samson now that his locks are unshorn.
If your throats become affected consult a good physician, or if you cannot do this, give what attention you please to the following hint. Never purchase “Marsh-mallow Rock,” “Cough-no-more Lozenges,” “Pulmonic Wafers,” Horehound, Ipecacuanha, or any of the ten thousand emollient compounds. They may serve your turn for a time by removing present uneasiness, but they ruin the throat by their laxative qualities. If you wish to improve your throat take a good share of pepper — good Cayenne pepper, and other astringent substances, as much as your stomach can bear.
Source: Lectures to My Students, lecture 8: “On the Voice,” 1:133-34.