You can become dependent on them but that's not the same as addiction. Addiction is having to take larger and larger doses of a drug in order to get the same effect. This is common with opiates like codeine, oxycodone, morphine, heroine, opium. Not common at all with Zopiclone although there are people with drug abuse issues who will take large doses with alcohol. I can't figure out what on earth they are 'looking for' by taking 10 Zopiclone tablets.
Zopiclone is good because even after using this drug since 2001, it is effective and I don't need to take a larger dose than I did 15 years ago. There's all this blabla about people dying from taking this sleeping pill but quite frankly, I don't think if it is used responsibly and if there's not some other 'issue' going on like morbid obesity and sleep apnea, or severe alcoholism or mixing and matching drugs that cause respiratory depression, the drug is not dangerous. It will make sleep apnea worse.
It's also, at least for me, the best muscle relaxant available. Baclofen is close to useless. Flexeril has a too long half life and results in being groggy next day. Zopiclone lasts for 6 hours. Other medications usually used for anxiety and as sedatives also have a much longer half life. Ativan, Diazepam, and other benzodiazepines stay in the blood for so long that multiple doses over time cause a buildup and tolerance.
There is another sleeping pill on the market that only has a 3 hour half life. It's mostly for people who can't get to sleep but then once they are asleep they are fine. Zopiclone is good for people who have trouble falling asleep and staying asleep.
The biggest problem with Zopiclone is the amnesia it causes. But then again, other medications can do the same thing.
I really hate it that people are offered something that really helps but there's all this fear about taking that medication. Because of pain I barely slept more than 4 lousy hours per night for at least 4 years. It took quite some time after starting to take Zopiclone before I felt better. I'm not going to stop taking it until I'm willing to 'experiment' with next to zero sleep.