Welcome needundersandin -
I'm glad you posted - your addiction is more unusual than most, but no matter what the substance, addiction affects us all in similar ways. It's been a while since the OP was here, but we're glad to have you with us, and maybe she'll be back and see this...
p.s. - also, you might want to google info on addiction to toilet bowl cleaners and/or moth balls. I read a little about it last year and there really are people out there who have the same addiction (apparently there is a chemical - I think it's PDB or PBD, something like that, that has an affect on some people and it's an ingredient in some of these products).