But people don't choose to become addicted. Some people can drink and never become an addict - some people develop the illness of alcoholism. Just like some people develop or are born with chronic illnesses and some don't.
People are very fixated on the initial choice to use a particular drug as though that proves addiction is a choice: if that were the case, everyone who ever has a Smirnoff Ice at 14 would become an alcoholic. But they don't. ("Oh but what about socially unacceptable drugs like heroin, you can't do that without really knowing how addictive it is?" is usually the response to this - and I worked in addiction services for quite some time and never, ever met an addict using heroin or crack that wasn't already actively 'addicted' - by which I mean the mental illness of addiction had taken hold, regardless of what drug they were using prior - before they took heroin/crack.)
Addiction is an illness you can be predisposed to (therefore being 'landed' with it, the same as your chronic condition). There's a degree of heritability in drug addiction (including initiation of use, so being literally predisposed to try taking drugs in the first place), and various things make you more likely to develop addiction. Plus you're more likely to develop an addiction if you have certain comorbid conditions such as ADHD or schizophrenia.
People see 'you choose to take X, therefore it's a choice' and they don't realise that it's the wrong way of looking at it - that the disease of addiction is 'unable to make choices about X like someone without the disease'.
YOU might be able to say, 'ooh, no, don't fancy drinking more, thank you' and put the bottle down. Addiction as a disease robs someone of the ability to make that choice in the same way.