Which smells indicate that wine/beer is bad?and can it have any negative effect on health?
Here is a list from the Wine Faults Wikipedia page. These faults, for the most part, will not do any harm when they are in wine (they aren't strong enough) They just taste bad.
Acetaldehyde Smell of roasted nuts or dried out straw. Commonly associated with Sherries where these aromas are considered acceptable
Amyl-acetate Smell of "fake" candy banana flavoring
Brettanomyces Smell of barnyards, fecal and gamey horse aromas Cork taint Smell of a damp basement, wet cardboard or newspapers and mushrooms
Butyric acid Smell of rancid butter
Ethyl acetate Smell of vinegar, paint thinner and nail polish remover
Hydrogen sulfide Smell of rotten eggs or garlic that has gone bad
Iodine Smell of moldy grapes
Lactic acid bacteria Smell of sauerkraut
Mercaptans Smell of burnt garlic or onion
Oxidation Smell of cooked fruit and walnuts. Also detectable visually by premature browning or yellowing of the wine
Sorbic acid plus lactic acid bacteria Smell of crushed geranium leaves
Sulfur dioxide Smell of burnt matches. Can also come across as a pricking sensation in the nose.