Due to the belief that certain agricultural products such as ginger, lemongrass, basil, grapefruit peel, pomelo leaves, and lemons can help prevent COVID-19 when inhaled, there has been a surge in demand for these items in Vietnam. This has led to a significant price increase, with some items becoming scarce and selling for 3-4 times the normal price. Small traders, especially those in ethnic minority communities, are capitalizing on this trend. However, a health professional warns against abusing inhalation and stresses the importance of following the Ministry of Health's 5K recommendations for COVID-19 prevention.