Voicing is not distinctive for Polish vowels (that means all things being equal they'll be voiced)
No shit. All IE have voice vowels. Every single one of them.
unvoiced vowels definitely occur in everyday speech, especially in unstressed syllables surrounded by unvoiced sounds (especially in the s,c, ś, ć and sz, cz groups) or in final position preceded by at least one consonant form the above group or two or more consonants one of which is from the above group.
Good point mafketis, this shows another dimension. There is such a thing as an unvoiced vowel in everyday speech.
It's all about the pairing and place in the word
What are you guys smoking tonight?
There is no such thing as unvoiced or voiceless vowels in English or Polish. None, Zero. Simple as that. It's not rocket science but linguistics 101, very very basic.
Repeat after me:
ALL VOWELS IN ENGLISH AND POLISH ARE VOICED
When u whisper the vowels, they are devoiced. LOL
When you whisper all phonemes are devoiced.
When and you sneeze while speaking all sounds are plosives.