Yes, addiction is an illness that has a powerful influence on thought processes; it usually takes a lot of time and effort to break. Besides, with some substances, especially alcohol, suddenly stopping is dangerous.
Sometimes, you’ll get senior people proclaiming that they’ve offered addicts ‘help,’ without mentioning that this ‘help’ has a lot of strings attached. People who are higher up maslow’s hierarchy of needs often don’t fully empathise with those at the bottom.