Exhibit
23.1
Independent
Registered Public Accounting Firm’s Consent
We
consent to the incorporation by reference in this Registration Statement of Greenlane Holdings, Inc. on Form S-1 Amendment No. 1 File
No. 333-281831 of our report dated August 14, 2024, which includes an explanatory paragraph as to the company’s ability to
continue as a going concern, with respect to our audits of the consolidated financial statements of Greenlane Holdings, Inc. as of December
31, 2023 and 2022 and for the years ended December 31, 2023 and 2022 appearing in the Annual Report on Form 10-K of Greenlane Holdings,
Inc. for the year ended December 31, 2023. We also consent to the reference to our firm under the heading “Experts” in the
Prospectus, which is part of this Registration Statement.
/s/
Marcum llp
Marcum
llp
Costa
Mesa, CA
September
6, 2024