SSI requires a student and instructor to know how to use a snorkel and it is required equipment for entry level classes.
depending on the diving you do, a snorkel may be very useful or dangerous.
for me personally, i enjoy snorkelling sometimes so i always have one in my gear bag, but unless i am teaching, i never wear one when i am diving because the type of diving i do simply does not require one. the negatives of havng one on me far out weigh any possible positives.
many people prefer to buy a folding snorkel and keep it stowed in a pocket if they feel they may need one for themselves at the surface for example, or possibly during a rescue where some may use it while performing rescue breaths.
depending on the diving you do, a snorkel may be very useful or dangerous.
for me personally, i enjoy snorkelling sometimes so i always have one in my gear bag, but unless i am teaching, i never wear one when i am diving because the type of diving i do simply does not require one. the negatives of havng one on me far out weigh any possible positives.
many people prefer to buy a folding snorkel and keep it stowed in a pocket if they feel they may need one for themselves at the surface for example, or possibly during a rescue where some may use it while performing rescue breaths.