For tobacco consumption, three categories were created to reflect regular smoking: 0=not a regular smoker, 1=smoke sometimes/once in a while (i.e. only sometimes, only at parties, only on weekends), and 2=smoke often (i.e. almost daily, daily). The ‘not a regular smoker’ category includes those individuals who stated they had never smoked and also those who indicated that they had only ‘ tried it ’ or ‘quit ’. This was done because of the phrasing of the question at waves 3 and 4. Participants were asked: ‘Do you smoke?’ with two responses stating: ‘No, I’ve only tried it ’ or ‘No, I quit ’.
