You have to wait 5 years after you obtained your own GC through marriage before you can file for a GC for another spouse. And if you don't become a citizen, there is a waiting period of a few years after you file.
Your case will be viewed with heightened suspicion if it appears that you probably knew the noncitizen spouse before obtaining your GC, and you will be doomed if you actually had a pre-GC relationship with the new spouse.