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@JDB
I can give you one con, lung problems. I've been commuting in Australia for years, first 3 months in London summer commuting 16 miles a day I had no problems kept fit and kept the weight off, but in the last 3 months my commute has changed to a run up through the heart of the city and my fitness has gone backwards. I found myself getting short of breath after sprints and just not being able to push it. After a ride to work I felt like I'd been smoking again, just thought I had 'London Lung' or some chest cold that hadn't cleared properly. After finding myself unable to complete sprint training at rugby a few weeks ago I took myself along to a GP and it turns out all this nasty air has turned me into an exersice induced asthmatic. Anyway a quick puff on the old Ventalin and I feel brand new again and it should clear up once I stop sucking on bus exhaust pipes.