Why do US politicians talk about 'Freedoms" all the time, but deny me the most fundamental freedom of all?

I agree in principal, however, the flaw is that you ingest your drug of choice and then don't impinge on someone else's rights. When in practice you ingest said drug, and then drive, or commit a crime. That is why we regulate said drugs. But to further your point, instead of taking your right to ingest said drug, we should allow it, until you do in fact impinge on somebody else's right at which time we punish you drastically.