Power of Attorney for Erik Atkisson

The filing is a Limited Power of Attorney document executed by Erik Atkisson, the Chief Legal Officer of Achieve Life Sciences, Inc. The document appoints Sandra Thomson as his attorney-in-fact to execute and file Forms 3, 4, and 5 in accordance with Section 16(a) of the Securities Exchange Act of 1934. The attorney-in-fact is also authorized to perform any necessary acts to complete and file these forms with the SEC and any stock exchange. The document grants full power and authority to the attorney-in-fact, including the power of substitution or revocation. The Power of Attorney remains in effect until Atkisson is no longer required to file such forms or until it is revoked or superseded by a new power of attorney.