You are confusing the term "addiction" with a tacit acknowledgement that we must have a government to enforce laws.
Enforcement of laws is one thing. However, based on your activity on this thread, you seem to be addicted to a form of government that attempts to reduce an extremely generalized and highly nebulous social "risk" by criminalizing a naturally-occurring substance.
That's about as "conservative" as your garden variety leftist societal engineering project.