Caffiene (also found in a lot of canned drinks) does hinder. During Induction is is best to keep off it - the whole idea of induction is to free yourself from the addictions.

I do drink coffee but now find I can take it or leave it. I'll drink it if I haven't had enough sleep and need to keep awake. I don't drink it on a regular daily basis.

I drink tea but am trying to cut down on that too.
Take care.