No, your immunity to viral infections doesn’t last forever. Cultures around the world wear masks when they are out in close proximity or if they are sick and you don’t see higher infection rates among them. Japan is a culture famous for wearing masks and they have a lower infection rate overall.
Is there no risk to weaken your immune system by continuously wearing masks even outside epidemic waves?
No. Masks do not weaken immune systems.
Found this study that claims it does, though I’m not knowledgeable enough to say if it is trustworthy. https://pubmed.ncbi.nlm.nih.gov/34585544/
No, your immunity to viral infections doesn’t last forever. Cultures around the world wear masks when they are out in close proximity or if they are sick and you don’t see higher infection rates among them. Japan is a culture famous for wearing masks and they have a lower infection rate overall.