The first week in parliament for the year will be busy with cannabis law reform and the MP Waka Jumping bills set to dominate.

Changes to the Misuse of Drugs Act will was debated yesterday.

The amendment creates a statutory defence for terminally ill people to possess and use illegal cannabis.

If passed, the waka jumping bill says an MP's seat will become vacant when they cease to be a parliamentary member of a political party for which they were elected.