The viscose process used to produce cellophane is highly toxic. The lyocell process is safer because the chemicals used are less volatile. But both require a lot of fine chemicals (carbon disulfide or N-methylmorpholine oxide or, recently, 1,5-diazabicyclo[4.3.0]non-5-enium acetate). This is why cellophane is typically used in small amounts and rayon likewise.
By contrast, lithium bromide is a stable salt and is basically as cheap as the elements used to produce it, so it can be easily scaled up and recycled.
By contrast, lithium bromide is a stable salt and is basically as cheap as the elements used to produce it, so it can be easily scaled up and recycled.