Infectious diseases in homeless people.

16–17 years (18.4%) were significantly more likely than students aged 12–15 years (7.3%) to be current tobacco smokers. There was no significant difference by level of socio-economic disadvantage, or between rural areas and urban areas; however, students in the Greater Southern Area Health Service (14.1%) were significantly more likely, and students in the Sydney South West Area Health Service (6.9%) were significantly less likely, to be current tobacco smokers, compared with the overall student population. As shown in Figure 1, there has been a significant decrease in the proportion of students who are current tobacco smokers, between 1984 (27.3%) and 2005 (10.3%).