Final answer:
The client should avoid high-humidity environments to protect the stoma.
Step-by-step explanation:
The client with a laryngectomy should avoid high-humidity environments to prevent discomfort and potential damage to the stoma. The stoma is the opening created during the surgical procedure that allows the person to breathe through the neck. Sleeping with pillows is actually recommended, as it helps in maintaining a proper position and prevents any pressure on the stoma. Water sports and strenuous exercises can cause water or sweat to enter the stoma and may increase the risk of infection, so these activities should also be avoided.