Ok... the process of fermenting perique turns the nicotine in it into more complex molecules, so there is very little nicotine in perique, however, the new molecules are known to increase the absorption of nicotine in the tobacco it is blended with.
Virginias actually have a shitload of nicotine, however the acidity prevents it from being absorbed well through your sinuses and small capillaries of your mouth. When inhaled it is easily absorbed into the lungs, which is why it is mostly used in cigarettes. When you add perique to Virginias, they become a hefty 6-7 one a 1-10 scale. However, burley and perique tends to go off the scales (or not), depending on whether the burley is a heavy nic burley. Burley can be light in nicotine to drenched with it. There are many more varieties of burley, so that depends on the strains uses and the curing of those strains.
I hope that helps.