It should be obvious that using the intense amount of ionizing radiation that CT scans use that of course they're causing a lot of cancer.
It's a shame our medical systems invested so heavily into CT machines at the expense of MRI's
Theoretically causing a lot of cancers in modelling studies.
In practice a CT machine is also a much better workhorse for innumerable tasks that are very hard to effectively investigate with an MR machine, as MR imaging takes significantly more time, and requires more technical knowhow among the medical staff involved.