How the tobacco is processed for pipe blends differs for the most part from how they are prepared for cigarettes. Casings, toppings, pressing into flake and other factors can change the flavor and in some instances the pH of the tobacco. Sometimes though blenders will use uncased burley or turkish, or shag-cut straight Virginia in a pipe mixture, and these will sometimes lend a cigarette note. Often burley and turkish are the offenders, but even a VA forward blend can get really acrid in a way that offends the nose.