Exhibit
31.1





Certification Of The Chief Executive
Officer - Pursuant to Rule 13a-14 or 15d-14 of the Securities Exchange Act of 1934, as Adopted Pursuant to Section 302 of the Sarbanes-Oxley
Act of 2002



I, Raymond C. Dabney, certify that:



| | 1. | I have reviewed this Annual Report on Form 10-K of Cannabis Science,
Inc.
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| | 2. | Based on my knowledge, this report does not contain any untrue statement
of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under
which such statements were made, not misleading with respect to the period covered by this report;
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| | 3. | Based on my knowledge, the financial statements, and other financial information
included in this report, fairly present in all material respects the financial condition, results of operations and cash flows
of the registrant as of, and for, the periods presented in this report;
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| | 4. | The registrant's other certifying officer and I are responsible for establishing
and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control
over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:
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| | a. | Designed such disclosure controls and procedures,
or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating
to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during
the period in which this report is being prepared;
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| | b. | Designed such internal control over financial reporting, or caused such internal
control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability
of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted
accounting principles;
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| | c. | Evaluated the effectiveness of the registrant's disclosure controls and procedures
and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of
the period covered by this report based on such evaluation; and
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| | d. | Disclosed in this report any change in the registrant's internal control
over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter
in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal
control over financial reporting; and
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| | 5. | The registrant's other certifying officer and I have disclosed, based on
our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of
the registrant's board of directors (or persons performing the equivalent functions):
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| | a. | All significant deficiencies and material weaknesses
in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's
ability to record, process, summarize and report financial information; and
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| | b. | Any fraud, whether or not material, that involves
management or other employees who have a significant role in the registrant's internal control over financial reporting.
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Date:  April 12, 2019



/s/ Raymond C. DabneyRaymond C. DabneyChief Executive Officer