Yes, the thread you linked to was definitely in violation of the rules- we have a STRICT no other substance policy - and that one violated the rules. We do not have the time nor inclination to give a personal message every time a thread is deleted - however we do leave a note on the thread which is visible if you view the forum in it's entirety.
One assumes that by "other substances" you mean other drugs, such as heroin, cocaine, ecstacy, etc.
not a bunch of household items suggested as a substitute in case a marijuana user is stuck in a foreign place with no hookups, and is addicted to the high.