Foods - There are several foods which should never be fed to your budgie because they are toxic. This includes chocolate,coffee,soda,caffinated beverages,avocada,rhubarb and the area of pitted fruits which touch the pitt.Many fruit seeds are toxic to birds,so to be safe always remove any seeds from fruit you give your birds.You should also avoid giving your budgie anything but limited amounts of milk based products, as birds are lactose intolerant.Also , do not feed your budgie anything considered to be junk food ( ie chips,fried foods,sweets,white bread,etc).
Certain UNCOOKED dried beans contain what are referred to as "proteolytic enzyme inhibitors." These enzyme inhibitors may prevent or decrease the utilization in the body of substances such as trypsin and chymotrypsin to produce nutritional deficiences.
Beans that can interefere with proteolytic enzymes are lima, kidney and soybeans. Cooking of the beans destroys these enzyme inhibitors. Other dried beans do not appear to contain these enzyme inhibitors, or if present, are in low concentrations.
A Bird's respiratory tract is very different from that of a mammal's, and actually concentrates any smoke or fumes in the air,making them markedly more toxic.Basically , by the time an odour is strong enough for you to smell it ( or even before that),the chemicals could be damaging your bird's respiratory tract.
The following should all be considered dangerous around birds:
Smoke from any source is hazardous. Secondhand smoke from cigars and cigarettes can cause chronic eye,skin and respiratory disease. Install smoke and carbon monoxide alarms. Tobacco is also toxic,so remove any whole or smoked cigars or cigarettes before allowing your bird access to a room.
Gasoline, kerosene, lighter fluid, and other petroleum products.
Paint, wood stains and preservatives, mineral spirits, turpentine, paint remover, paint thinner,and other solvents.
Cleaning supplies and disinfectants including bleach, phenols, ammonia, pine oil, spot remover, window cleaning solution,fllor and furniture polish,scented candles,potpourri,tea tree oils,essential oils and air fresheners.Perfumes,hairsprays,room deodorizers,deodarant,nail polish remover and anything else with a propellant.
Other items that can give off fumes such as glues, permanent markers, and mothballs.
Do not use the above items in the presence of birds. If they are being used in large areas of the house,it is best to remove the bird from the house temporarily.
Incense contains: charcoal, starch, karaya gum, clay, aromatic chemicals and essential oils.
The essential oils have the potential for causing toxicity in birds in the same way as the essential oils in scented candles, air fresheners and carpet fresheners.
It is not recommended that you burn incense in an area where birds are exposed to the fumes.
A must read link