Possible. It would begin to smoulder, depending on the fabric it came in contact with, then might eventually ignite a flame which would more than likely snuff itself out when the oxygen in the casket was depleted.
tobacco is inside the cigarette.
Inside an Egyptian coffin is a mummy and occasionally a bag of dead butterflies
The stone container of a wooden coffin was called a sarcophagus.
The inside of his coffin.
nicotine
inside the chapel or under his castle
It was called a sarcophagus (Latin- "flesh eater"), hence the wooden coffin fit inside the stone receptacle.
For her funeral she was in a lead coffin (covered in purple velvet and a life-like effigy). But she must have had a double coffin (a coffin inside a coffin) because in the 1800's when her tomb was opened it was reported she had a wooden coffin so her wooden coffin must have been inside the lead one, although I cannot confirm this, its only an assumption. its also possible that she had a lead coffin for the funeral and her body was then moved to a wood one later. point being, she had one lead one, and one wood one.
nicotine and tobacco
YES
usually about 45 psi
Princess Diana is said to have had one of the coffins typically used for British Royals: an oak coffin in the shape of a hexagon; inside a coffin liner made of lead.