Obvious answer is no but...
I quickly see a difference when I don't get much fruit (or fruit-juice) for a few weeks, my gums start bleeding more easily and get a bit painful - known consequences of a vitamin C deficiency, among other possible causes of course.
It quickly gets better if I drink much more fruit-juice for a week or two.
I know it does not seem related to vegetarian diet, but it never happened to me before and I was not eating healthily at all.
Is there any side-effect of the veggie-diet that could make me more prone to vitamin C deficiency?
Could it be some other vitamin that used to compensate for a lack of vitamin C but that I get less of now as a vegetarian (for almost 2 years)?
I have been a bit low on B12 for example, could this destabilize the way I process or store the vitamin C?
Or as even more unlikely reason, could a lack of sun make a difference here? I moved to a not-sunny country.
Edit: Interesting point in @Panther's link :
Vitamin C can also increase your body's absorption of iron from plant-based foods.
So as a vegetarian you may get less iron from your plant-based food if you don't get enough Vitamin C?