By "unbounce ads", I guess you mean using Unbounce landing pages (always have a domain and never use the unbounce subdomain in GAds.
Regarding advertising cannabis in GAds, on paper, Google considers cannabis as a recreational drug. It doesn’t matter how or why people use it, their policies does not allow you to advertise it. Since 2019, Google has been running closed test programs for CBD companies. This means some specific CBD companies and have been given permission by GAds to run ads. BUT, the workaround is to do it the blackhat way : use alternative keywords and cloaking. (I do not provide any blackhat coaching, please note).