Vicks VapoRub is safe for temporary relief of coughs and muscle aches when applied externally on the chest or throat. Avoid regular or long-term use; it contains camphor, which can be toxic if over-absorbed. Never apply it inside nostrils, under the nose, or on broken skin. It is strictly unsafe for children under two, as it can trigger severe breathing issues. Side effects may include skin irritation or allergic reactions. Long-term use is not advised. Always consult your doctor if symptoms persist.