It's a very mild topping, so I understand your point, but it seems the majority opinion on this forum is that capstan blue is an aromatic. So it's not my statement alone.
There was a recent thread about it if you can be bothered to find it.
A thin slice of cake please Mrs Wilberforce.
But in a cob it is best to let the cake build up so that it is impossible to get any tobacco in the offending article and it can't be smoked ?