Power of Attorney for Benjamin Halladay

This filing is a Limited Power of Attorney document. Benjamin Halladay, Chief Financial Officer of Achieve Life Sciences, Inc., has appointed Sandra Thomson and Erik Atkisson as his attorneys-in-fact. They are authorized to execute and file Forms 3, 4, 5, and Form ID with the SEC and any stock exchange on his behalf. This power of attorney also allows the attorneys-in-fact to take any action they deem beneficial, in the best interest of, or legally required for Halladay. It supersedes any prior powers of attorney and remains in effect until Halladay is no longer required to file such forms, unless earlier revoked or superseded. Halladay agrees to indemnify the company and attorneys-in-fact against any losses arising from inaccurate information provided.