There are a few caveats:
-Aluminium/aluminum melts at 600C/1112F which if the BBQ is cranked up can cause the sleeve to melt.
-Allegedly Aluminium causes Alzheimer's disease
-This sleeve may "off gas" as I have no idea what it's been coated with
-This video is for entertainment purposes.
In my first attempt just to check temperatures, the sleeve was cool enough for me to hold it with an open palm for about 10 seconds.
Smoking does not really need is not a hot fire so I'm sure this is going to be safe and do the job; I'm going to use it beside the risks.
When I smoke my first chicken, pork, turkey or anything else, I'll let you know how it tasted, if I survive