I'm sorry I came late to this excellent thread - some great stories and comments.
For years, I was painfully conscious about smoking a pipe, especially as I've never smoked cigarettes and so didn't understand how smokers interacted. I smoked alone for fear of ridicule and bumbled along on pipes and tobacco recommended by staff in tobacconists for the same reason. It is now extremely rare to see a pipe smoker in public in London, so this reticence continued for a long time. Then two things happened: first, I discovered this site and second - following on from the first - I decided I would make a point of smoking where I wanted, providing I wasn't causing offence or harm.
I take my pipe pouch everywhere now and I've faced the world down one day at a time. My long-suffering wife, who calls herself a pipe widow, tolerates it and doesn't wince (visibly) when I smoke a pipe in public with her. I've lit up on family occasions, in front of clients, and with service providers. I've smoked my pipes in the designated areas at conferences and airports, pubs and tourist attractions. I've told my staff and colleagues about my hobby and then smoked a pipe in front of them; given that they average half my age (some are younger than that) there was a range of reactions, but none any more negative than bewilderment and miscomprehension. I've had the "My Granddad used to..." line a number of times and a fair bit of "I like the smell..." I get the odd smirk as I walk across London Bridge but I've also been supported by a lovely group of (American) ladies when told to desist by an over-zealous security guard in Covent Garden. Schoolchildren visiting the sights near my office are fascinated and often comment to their teachers, none of whom have - yet - said anything that was less than positive.
Without wishing to sound like a therapy patient, I came to realise through participating in this site that my pipe is for me and my enjoyment. I love smoking a pipe and the peace and happiness it brings me. I've raised a family and now have grandchildren. I have worked like a nutter my whole life and still have about 10 years labour to go. As my wife told my children when I went public, I've earned this. 'Nuff said.
Andy