I never really notice a big difference between so called high nic and low nic blends. Unless it's in a extreme sized pipe like a super small or super large chambered pipe. Just one of those stray thoughts about pipes. But if I smoke a really low octane blend in a tiny pipe I'll still feel like I need more, or if I smoke something strong I'll feel like wow that's strong. But in an average sized pipe I can't tell much difference. Probably just me.