Abstract
We analyze further the IR singularities that appear in
noncommutative field theories on 
d. We argue that all IR
singularities in nonplanar one loop diagrams may be interpreted as
arising from the tree level exchanges of new light degrees of freedom,
one coupling to each relevant operator. These exchanges are
reminiscent of closed string exchanges in the double twist diagrams in
open string theory. Some of these degrees of freedom are required to
have propagators that are inverse linear or logarithmic. We suggest
that these can be interpreted as free propagators in one or two extra
dimensions respectively. We also calculate some of the IR singular
terms appearing at two loops in noncommutative scalar field theories
and find a complicated momentum dependence which is more difficult to
interpret.