Is it really that strong? Strongest I have tasted is Gawith Hoggarth & Co Dark Flake Unscented- which I can tolerate for about 50-55 mins.
PS - Other tobacco which I think is less strong than Dark Flake Unscented: (In no particular order)
1. War Horse Bar
2. Five Brothers
3. Bold Kentucky
4. Old Joe Krantz
5. Samuel Gawith Black XX Twist
In my opinion Rustica is a bit stronger than Dark Flake unscented. The difference is not big, though.