6533b7cefe1ef96bd125784d

RESEARCH PRODUCT

An extended version of the theory of planned behavour: Prediction of intentions to quit smoking using past behaviour as moderator

subject

description

It was hypothesised that: (i) intentions to quit smoking were predictable from group identity, self-identity, moral norms and past quit attempts, beyond the components of the Theory of Planned Behaviour (TPB), and (ii) that past experiences with the behaviour (quit attempts) would increase the predictive utility of the extended TPB model on intentions. The data was collected among 357 daily smoking students (M = 24 years). The TPB components accounted for 12.3% of the variance in quitting intentions, while the extension variables added 16.5% to the explained variance in intentions beyond the impact of the TPB. Past behaviour had the strongest impact on intentions (α = 0.30), followed by moral norms (α = 0.25), perceived behavioural control (PBC, α = 0.20), attitude (α = 0.18) and group commitment (α = −0.11). By splitting the sample into three categories of past quit attempts the picture changed, revealing that the predictive utility of the TPB increased with the number of quit attempts (no past quit atte...