I gave up smoking when I was diagnosed with oral cancer, and switched to vaping, with the specialist's "approval". Now I'm trying to give them up too but have at least cut down the nicotine strength to abt 25% of what I originally. I don't smoke those that produce lots of smoke.
Nor do I smoke in the street unless I can find an open area with no people or windows. A lot of outdoor areas are "no smoking or vaping" nowadays and I respect that. I would consider a garden centre to be an enclosed space and not puff there unless there was a dedicated area.
Yes, I've nipped out the back of A&E before now, thinking it was not allowed and found the floor covered in dimps!