Active smoking is a risk factor for CD, but does not affect the outcome; passive smoking is detrimental for the outcome of CD patients. In UC, active smoking shows dose-dependent beneficial effects. Our data suggest that passive smoking is a novel risk factor for CD.

In the present randomized controlled trial (RCT) it was investigated whether single women, 55 years of age and older, improved with regard to self-management ability, well-being, and social and emotional loneliness after having participated in a newly designed self-management group intervention based on the Self-Management of Well-being (SMW) theory. The expected mediating effect of self-management ability on well-being was not found. Although self-management ability, well-being and loneliness improved significantly in the intervention group immediately after the intervention, and also remained at this improved level after six months, there was also improvement in the control group after six months, rendering the longer-term differences between the groups non-significant. It can, however, be concluded that, although the longer-term effectiveness could not be proven, this SMW theory-based intervention seems to be useful in supporting older women to improve their self-management ability and well-being.

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There are no differences in changes in smoking behaviour at and after diagnosis between CD and UC patients, suggesting a lack of knowledge in these patients about the link between their disease and smoking behaviour. However, CD patients seem less refractory to smoking cessation than the general population. Therefore it is worthwhile putting energy in helping CD patients stop smoking.

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