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How often do you hear those defending the smoking ban, on health grounds, go on to argue that speed limits are 'restrictive' and that health and safety legislation is over the top and how they hate the 'nanny state'. You are as well asking people to give up drinking or the more dangerous sports, or even over eating, as you are smoking. The fact is pubs have always been a haven for smokers and, in areas where suitable sheltered areas outside cannot be provided, a two tier system would give more pubs a chance of surviving.
When I started going into pubs on a regular basis, probably underage, my friends and I would sit at a table and try not to attract too much attention in case we were thrown out. Too often these days the underage drinkers are the ones running in and out, swearing loudly at their 'mates' and standing with their ears glued to their mobiles. They know they will get away with it because too many landlords will do nothing about it (afraid of being sued if they get too close) and PCSO's, who are allowed to patrol the streets, are not allowed to follow groups of potential trouble-makers into them.