When I walk down Venice Avenue, I always check a small alleyway that I have used for stranger portraits in the past. It runs roughly north and south. In the afternoon the western side is along a shaded wall, and a white wall on the eastern reflects bright sunlight. As I passed, I saw Tammy, standing, smoking a cigarette.
When I approached her and explained my request, she smiled a bit but shook her head 'no' and said that she didn't want a picture showing her smoking. I assured her that it would be a headshot, not including the cigarette (although I would have liked that). Then I showed her my Flickr Photostream on the cell phone, and she acquiesced.
She was interested in the concept of photographing strangers, but I do not believe that she took a card with my information.