New Zealand Law Society prosecutions manager Mark Treleaven said the tribunal's decision was "entirely justified".
"This is a serious matter which has marred the high standard of conduct that is expected of every lawyer in New Zealand," he said.
Mr Blair works at the Rotorua People's Advocacy Centre and said for him it would be "business as usual".
"The two marijuana offences took place in December 2010 and it will now be 2018 before I can practise as a lawyer again.
"For me it is business as usual and I will be continuing my advocacy work in the Rotorua community much as I have done over the last 20 years."
Mr Blair said he believed the suspension was "relatively tough, however the penalty fell short of being struck off the roll of barristers and solicitors and I have to take that as a positive".