Short answer is No
Vomiting is not caused by all deseases and sickness is not the only reason for vomiting.
I got vomits sometimes like while traveling, after eating outside, after drinking alot of whiskey but not when I was sick
You can avoid vomiting by Breathing fresh air all the time, avoiding strong odored medicines, Always eating only home made food, avoiding excess drinking of alcohol to great extent. Smelling fresh lemon during journey is very helpful if you have vomit problem during journey.
Vomiting may indicate food poisoning, allergy, overeating, gastritis, ulcer or bulimia etc.
If vomiting lasts more than one day please call the doctor otherwise things may turn seriously bad.
Or if there is any blood in vomit or if you have serious headache or stiff neck, or serious abdominal pain, rapid breathing or pulse. You should seek immediate medical care