Plastic spoon melted in fried oil and released some small black particles of plastic while cooking. i ignored and ate the food. now i am so nervous if it is dangerous for health or not and if it really cause cancer to eat or inhale melted plastic?

I won't lose my sleep with this incident, take care.

What you described will not have any harmful effect. The plastic you ate will go out with your stools. For healthy diet: http://www.choosemyplate.gov/., exercise 30 minutes/day, drink enough water daily so your urine is mostly colorless, have safe sex, no tobacco alcohol weed or street drugs. Get HPV vaccine. Wish you good health! Safe sex: https://www.hopkinsmedicine.org/health/wellness-and-prev