while i can't say what cough sweets,
i can say that i found ginger to most helpful with breathing ( asthmatic)
and it helped missus last week who was coming down with the much weaker, womanflu.
(said in brotherly solidarity
)
Get some ginger, slice up about an inch or more, place in pan of water..(think 2 cups of water)
you make it like you'd make tea or coffee, if kettle busted.
bring to boil, simmer gently for 5-10 mins, serve with slice of fresh lemon, and sweeten if needed.
(obv, i can't do that anymore, but i did love it with honey..)
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LINK
Ginger
LINK (see 8:25 mins)