Table 2.

Substance involvement distributions.

Involvement Group	Alcohol	Nicotine	Cannabis	Cocaine	Opioids
No/Non-Regular Usea	258	595	659	1591	2043
Use, 0 Symptoms	517	159	1153	416	305
Use, 1–2 Symptoms	591	499	312	83	45
Use, 3–5 Symptomsb	648	1120	278	131	52
Use, 6–7 Symptoms	559	180	168	348	124

^aFor illicit drugs (i.e., cannabis, cocaine, and opioids), the lowest level of involvement included individuals who had never used that particular substance; for licit drugs (i.e., alcohol and nicotine), individuals who had also never used the substance regularly (i.e., drinking at least once per month for 6 months, or smoking 100+ cigarettes in one’s lifetime) were also included in the lowest involvement category. ^bSymptoms were not required to cluster within a 12-month period.