premise: Glue sniffing is most common among teenagers. They generally grow out of it once other drugs such as alcohol and cannabis become available to them. Seven-year-olds have been known to start "glue sniffing". Because of the social stigma attached to "glue sniffing" most snifters stop around 16 or 17 years, unless they are seriously addicted.
hypothesis: Glue-sniffing is common among youngsters.