PubMed Central, Figure 1: Addict Behav. 2008 January; 33(1): 122–33. Published online 2007 September 8. doi: 10.1016/j.addbeh.2007.09.009.

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Figure 1. Age at first substance use in French adolescents and young adults: the GAZEL Youth study (1999) (mean)¹

¹ Sample size and p-value: cigarette smoking: n=643, p<0.0001,cannabis:n=314, p<0.0001, illicit drugs other than cannabis: n=36, p<0.0001, inhalants: n=36, p=0.74, prescription medications: n=33, p=0.0063.