"I absolutely stand by the decision for ACC to set targets around the number of long-term claimants. What I reject is any notion that those targets were set on the basis of arbitrary financial numbers."
He also takes exception to Ms Pullar's portrayal in the media.
"At the time I resigned in March the media coverage and view of Bronwyn Pullar was incredibly negative, that she was a manipulative and almost evil person who was abusing her National Party links to try and get an advantage that others couldn't.
"Ironically, since then as more has been told of her story there's a substantive body in both the public and media who are very sympathetic to her position. Some people have described Bronwyn Pullar as the villain, some as the hero, I actually think both those views are wrong.
"She is an unfortunate person who had a nasty accident who was a high-income earner whose battle with ACC has become the complete focus of her life."
Since his resignation, Dr Smith said he had been able to spend more time with his family and also doing constituency work.
He had also been able to spend more time seeking expert advice in policy areas of interest which are likely to be part of the Government's legislative focus in coming months including water, climate change, land use planning and earthquake standards.
That work would be useful "whether I be a backbencher or a rehabilitated minister".
"I'm hopeful I might again be given that opportunity at some stage but equally so that is a call totally for the Prime Minister."