I think I may have coughed during a performance back in 65, or was it 69 - can't remember.
As for the effects, well if I need to I just sing softer, or louder, whatever is required. Like I said, it's called vocal control. You think Garth Broods, Nugent, Madonna, Sher, Jimmy Buffett, and a huge number of other top performers are all wrong? They enjoy the freedom while playing an instrument that a headset mic permits, and I do too. Come to think of it, I have a photo somewhere of Willie Nelson wearing a headset mic. Maybe it's something relegated to folks that play more country than pop.
Good Luck,
Gary