In fact, because chewing gum has been recognized to reduce tension and contribute to alertness, the U.S. armed forces supplied chewing gum to the troops in the first and second world wars and still include it in field and combat rations.
حتى ان بعض السائقين وجدوا ان مضغ العلكة فعّال اكثر من شرب القهوة في ابقائهم مستيقظين .‏