addict (one) to (something)
To become, or cause someone else to become, dependent on a particular substance or thing. That first use of cocaine addicted me to it. So many people have addicted themselves to caffeine.
addict someone to something
to cause someone to become habituated to something, usually alcohol or some another drug. The hospital personnel were thought to have addicted John to morphine. She ended up addicting herself to the substance.
addict
n. someone showing a strong preference for something or someone. (Not related to drug addiction.) Sam is a real opera addict. He just loves the stuff.