Baiting for chipmunks generally does not work. There are many reasons why baiting is not effective. First, chipmunks like to eat several different things. It is likely that they will feed on what is most tasty, abundant and in season. Generally, this will be some insect, fruit or nut.
Rodent bait is neither succulent, fresh or tasty.
Rats and mice are not as picky and will readily feed on rodent bait. Chipmunks are more finicky and may readily hoard bait placements for a later date. This leads you to believe they are eating your bait when in fact they are simply storing it in case there is a shortage of more desirable food. Secondly, rodent bait is formulated for rats and mice. During the product design stages of rodenticides, the manufacturers do not even consider whether or not a chipmunk will like the taste.