> What about people who have difficulty breathing, and have to have their breathing hindered for hours by the mask?

That is why vaccinating and wearing masks is so important: you're not just protecting yourself, but also those who legitimately cannot get vaccines (e.g. due to allergies), where the vaccines are ineffective (people with autoimmune disorders, on immunosuppressants or with a generally non-respondent immune system), or who cannot wear masks at all or for prolonged amounts of time (e.g. people with claustrophobia or weakened lungs).