Specifically, we used a random intercept in the mixed-effects model to account for the within-study correlation and used a study-specific random slope with respect to the signal to capture between-study heterogeneity
Talking on the phone or chatting
Lung cancer: a prospective study of smoking, occupation, and nutrient intake
In the first comprehensive analysis of the DNA of cancers linked to smoking, researchers studied over 5,000 tumours, comparing cancers from smokers with cancers from people who had never smoked
Department of Health, Education, and Welfare
Organisations like the NHS, Cancer Research UK, ASH, and the British Lung Foundation all suggest even without long-term evidence that e-cigarettes can be a useful way to wean off nicotine slowly and offer less harm as a product that you inhale