Fig. 1.

Heavy smoking levels (> 20 cigarettes per day) amongst participants from 2001 to 2007 as a function of low (24.1% of sample), medium (29.9%), and high (46%) self-control levels assessed in 2001.

Note: The 2004 workplace smoking ban and tax increase on tobacco were introduced in the period between the collection of the 2003 and 2004 survey waves.