That's an inapt slippery slope analogy. The supposed bastion of freedom, the US, still has states where books are banned. And abortion is functionally banned.
Not all freedoms are the same. Losing one doesn't equate with losing all of them. Equating the freedom to become addicted (or indebted perpetually) is not the same as the freedom to read or travel, etc.
Who gives the right to define something as addictive and therefore, bad, and other stuff as not and therefore virtuos.
Why do we got the right to moralize some stuff as being "an slave of a substance". Aren't we all slaves of water, nutrition, companionship, shelter? Why do I get to feel superior to the cocaine user?
Not all freedoms are the same. Losing one doesn't equate with losing all of them. Equating the freedom to become addicted (or indebted perpetually) is not the same as the freedom to read or travel, etc.