Responsible for the deaths of around 100,000 Britons per year, including around a third of all cancer deaths per year. There is no safe dose of nicotine.
Smokers use up caffeine much faster than non-smokers. Stop smoking and blood cafeine levels go up by as much as 250% even when coffee consumption stays the same; these high levels are maintained for at least 6 months. Ex-smokers with coronary heart disease can face added risks as caffeine is a stimulant and can greatly increase the work of the heart. So when giving up smoking, drink decaffeinated coffee, preferably starting some weeks before trying to quit..
Smokers have a 5% more chance of developing an allergy if smoking when first exposed to a particular allergen.
Various sources - no dates.
