"Fumer" is a French word that means "to smoke." However, if one wants to express a similar concept with a different word, there are many synonyms available. For instance, "smoldering," "burning," "blazing," and "igniting" are all synonyms of "fumer." Additionally, "vaporizing," "evaporating," and "steaming" could be considered synonyms in certain contexts. Likewise, "fuming," "suffocating," and "choking" are synonyms that indicate the negative side effects of smoking. In summary, there are numerous synonyms for "fumer," each with a slightly different connotation depending on the situation. It pays to study them and use them efficiently in your conversation or whenever writing.