It has recently come to my attention that pig blood is used in the manufacturing of cigarettes. Would this making smoking cigarettes haram?
This would depend on whether istihala occurs during the process of manufacturing on it. Istihala is a process whereby something moves changes from its original form to become something essentially different (e.g. if najis wood turns to ash the ash is not najis). If the pig blood changes to become something essentially different through various chemical processes then it is not a factor in this issue. The other thing to consider is whether the pig blood makes the rest of the substances najis if it comes into contact with them before istihala occurs.