Breakdown of Maintenant, je ne fume plus de cigarettes.
je
I
maintenant
now
ne
not (used before the verb)
de
of / from / any (in negative sentences) / about (concerning)
Questions & Answers about Maintenant, je ne fume plus de cigarettes.
Why is it de cigarettes instead of des cigarettes?
How do I know where to put ne and plus?
They hug the conjugated verb, exactly like ne... pas. In this sentence, the verb is fume (smoke), so you put ne before it and plus right after it: ne fume plus.
Can I keep pas and say je ne fume pas plus de cigarettes?
Do I pronounce the 's' at the end of plus here?
No, the 's' is completely silent. When plus is part of the negative expression ne... plus, it is simply pronounced like "plu".