Burnt cashew nut on stove and it went black. i was cooking food at same time and strong burning smell from the nut. inhaled for about 1 hour - food cooking for same amount of time. have i ingested and can this cause lung cancer?

The smoke may irritate the lining of your throat and upper airway, but no long term damage is likely. Keep a window open, ventilate the kitchen. Watch for signs of shortness of breath,cough and fever.

Lung cancer is not a risk from what you described. As long as there was no immediate respiratory symptoms like cough, feeling of choking, you are okay. You can reduce your risk of cancer : Eat a mostly vegetarian diet, avoid alcohol, tobacco and street drugs, avoid excessive exposure to sun, get HPV vaccine, exercise 30 minutes each day, drink enough water so your urine is mostly colorless.