From David Waltner-Toews, Kitchener, Ontario, Canada
Lara Williams's comment on vaping on public transport reminded me of conversations back when smoking was allowed on buses, trains and aeroplanes (1 September, p 22). The person in the seat next to you might ask, “Do you mind if I smoke?” and perhaps add, “Just a bad habit. Can't shake it.” The appropriate reply was, “Not at all. Do you mind if I fart? Just a habit I have. Can't seem to shake it.”
