A blunt is a cigar that has had its tobacco filling removed and replaced with ground cannabis. The cigar wrapper is then re-rolled with the cannabis and smoked like a cigar. Blunts are often considered a more traditional form of consuming cannabis and have a distinctive flavor and aroma due to the cigar wrapper.
A pre-roll, on the other hand, is a pre-rolled joint that is filled with ground cannabis. Pre-rolls are a convenient option for those who do not want to go through the process of rolling a joint themselves. They come in a variety of sizes and strains and are often sold in dispensaries.
In summary, the main difference between a blunt and a pre-roll is that a blunt is made using a cigar wrapper and a pre-roll is made using rolling papers.