I think what many people are failing to recognize is the fact the CSA is regulated under the commerce clause. The power to regulate commerce is not a power to restrict, prohibit or deny.
The CSA was never intended to be directed at users outside of commerce. No rules of the legislature can be construed to deny the rights of the people rather they be enumerated or not. This includes, but is not limited to the right of self-ownership of one's body, the right to regulate one's own health, the right to grow and consume the natural plants and herbs of the earth etc.. etc..
HEALTH AND SAFETY CODE
TITLE 6. FOOD, DRUGS, ALCOHOL, AND HAZARDOUS SUBSTANCES
SUBTITLE C. SUBSTANCE ABUSE REGULATION AND CRIMES
CHAPTER 481. TEXAS CONTROLLED SUBSTANCES ACT
SUBCHAPTER A. GENERAL PROVISIONS
(48) "Ultimate user" means a person who has lawfully obtained and possesses a controlled substance for the person's own use, for the use of a member of the person's household, or for administering to an animal owned by the person or by a member of the person's household.
http://www.statutes.legis.state.tx.us/Docs/HS/htm/HS.481.htm
Title 21 United States Code (USC) Controlled Substances Act
SUBCHAPTER I — CONTROL AND ENFORCEMENT
Part A — Introductory Provisions
§802. Definitions
(27) The term "ultimate user" means a person who has lawfully obtained, and who possesses, a controlled substance for his own use or for the use of a member of his household or for an animal owned by him or by a member of his household.
https://www.deadiversion.usdoj.gov/21cfr/21usc/829.htm
