Thanks for your question on Health Care Magic.
I can understand your concern.
No,
cough is not side effect of artificial sweetener.
It is mostly due to
respiratory tract infection. Most common is viral upper respiratory tract infection.
So better to avoid oily and spicy food.
Avoid junk food. Drink plenty of fluids orally and keep yourself hydrated.
Start antihistamines and anti inflammatory drugs.
Do warm water gargles 5-6 times a day.
You will mostly improve in 1 week.
If not improving in 1 week than get done chest
x ray to rule out lower respiratory tract infection (LRTI).
Hope I have solved your query.
I will be happy to help you further.
Wish you good health. Thanks.