The following smells are sometimes given off by the plastics listed:
Carbolic acid - phenol formaldehyde
Formaldehyde - casein formaldehyde
Milky, if rubbed - casein formaldehyde
Mothballs (camphor) - cellulose nitrate
Plasticky (new car smell) - polyvinyl chloride
Sweet - polyvinyl chloride but only when degrading
Sulphurous - vulcanised rubber
Vinegar - cellulose acetate
Vomit /rancid butter - cellulose butyrate, cellulose acetate butyrate
Waxy - polythene