Drug.

I'm addicted to green tea. By the way, it contains caffeine, tannins, and catechins – a potent combination that significantly alters one's state of consciousness. When consumed in large doses, green tea induces euphoria and enhances brain function, and can even forcibly wake you up. If you become addicted to green tea, withdrawal symptoms may appear if you neglect brewing it for an extended period. These symptoms include headaches, irritability, and aching limbs. I'm a hardcore addict, consuming an average of 3-5 liters of strong green tea daily.
I'm also addicted to kefir (where is the poll option?). This, by the way, is an alcohol-containing liquid of animal origin that restructures the gut microbiome and even (!) invades it with its own fungal microorganisms. As a result, the stomach becomes accustomed to kefir and begins to regularly demand its dose. My kefir addiction is currently in its early stages – I consume about three packs per week. But in the summer, there's a kefir surge, and I drink one or two packs daily.
I'm addicted to a sense of grandeur, compounded by solipsism. Because it gives me the strength to fight against life's difficulties ;)