Cinnamon and PG is bad news. Not only cracking tanks, but actually dissolve the plastic into the liquid - something you really don't want to vape.
There's an exception where the cinnamon flavor is suspended in alcohol, but juices that contain alcohol (typically 5 to 10%) are certainly not recommended for people who have an alcohol problem.
There have been reports of (sober) people being found positive in alcohol tests from vaping juice that contains alcohol, so you really want to choose your liquids based on information and not just flavor or price.
Alcohol is often used in flavor extraction and/or to dilute the thicker VG liquids. I would advise people on this forum to ask the manufacturer (the shops probably won't know) if there is any alcohol in their liquids.