I believe it will grow as a percentage of per capita. I believe our Government does not understand addiction and there is a lack of educational resources. Inflation will increase as Asia enters a recession and this will further strain the nuclear family creating more environmental stress on children that will find escape in substances and behaviors. I see this leading to a great percentage as a proportion of the population. I see obesity as a leading indicator.
Given the likely legalization of marijuana the good news is we will have a wider variety of legal substances to become addicted to in the US. I wonder when pot commercials will be on TV? I can just picture a Caribbean scene with a Rastafari on the beach and a girl in a bikini with a one hit bat sauntering down the beach to some Bob Marley playing in the background.