'tiryaki', or inveterate, or addict

I'm trying to translate the Turkish word 'tiryaki' to English. The definition is anyone who has the long-established habit of using tea, coffee, tobacco, etc. You can translate it, I think, either as 'addict' or 'inveterate'.

Of course being a tiryaki involves addiction, like when people say, 'I have to have my coffee every morning!'. But being a tiryaki is not being an addict alone. The word tiryaki emphasises the existence of a long-established way of consuming that substance, too: e.g., a coffee tiryaki would have an established taste for coffee from a particular shop. Also a tiryaki knows best: A tea tiryaki knows which brand is good, which is bad; where to buy your tea, how to keep it fresh, and most importantly, how to drink and enjoy it. So: An addiction is considered bad. Being a tiryaki isn't so much. For example you never use tiryaki in the case of drug-addiction, and there's another Turkish word for that ('bagimli ', if you need to know).

My problem with the second, 'inveterate', is that first of all it sounds archaic to me. I have never ever heard anyone use it before, spoken or printed. Secondly, I'm not sure whether it can be used to convey a positive sense of habitual, addicted use. What sense would the phrase 'an inveterate coffee drinker' convey to you?

Thanks for the help!