While there's little doubt that electronic cigarettes expose users to far fewer carcinogens and irritants than conventional cigarettes, the ingredients found in the liquids can vary greatly from product to product, says behavioural scientist Alexander Prokhorov at the University of Texas MD Anderson Cancer Centre
The images divided fans, with some condemning his actions for setting a poor example for his young admirers, while others defended his right to personal lifestyle choices and privacy
Beyond the unsightliness of cigarette butts littering urban landscapes in the UK, they pose a tangible threat to terrestrial ecosystems
Fundamentally, tobacco researchers on both sides of the argument want the same thing to reduce death and disease
As it burns, hickory fills the air with a deep, steady warmth that quiets the room and softens the day