Alice, you're out of control! Thanks for sharing your knowledge/research. I DO avoid fizzy drinks and cold drinks in general, and popcorn, for that matter. And once I did sing nightly with no warm-up and no regard for the strains I was inflicting. As I explained in another thread, that led to nodes on my chords and a voice that is, a decade later, damaged: weaker and more limited in range and tone. This may be a rare case where I actually learned my lesson, so to speak.