Smoking more than 20 cigarettes a day almost triples the chances of suffering a potentially fatal brain haemorrhage, research has shown.
Quitting reduces the danger but heavy smokers who give up tobacco are still twice as much at risk as people who have never smoked.
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Shoppers who don't bring their own bag will need to buy a bag for life costing 8p or 10p.
Temperatures will reach around 28 Celsius (82F) at their highest.
A minute's silence will be observed at 11am on Thursday in remembrance of those who lost their lives in the Manchester Arena attack.