I been boiling vicks vapor rub on stove for my dry cough and keep my breathing good can it cause sinus infection? i do it twice a day?

No: Steam or vapor alone would be just as useful, Vicks is not adding any medicinal effect. Have a healthy diet, exercise 30 minutes/day, drink plenty of water daily so your urine is mostly colorless, have safe sex, no tobacco alcohol weed or street drugs. For nutrition: http://www.choosemyplate.gov/. Get HPV and Covid vaccines. Wish you good health!