Passengers may sit close together for long journeys, with limited control over ventilation.

Your nose can become accustomed to its own perfume even while other people notice it.

Avoid reapplying during a journey and respect fragrance-free requests.

Fragrance etiquette where people share spaces. This guide is editorial information rather than a claim about the formula, safety or stock of any XASIS concept. Follow finished-product directions and labels.