In an instant once the mrs thought it was the way forward. I had tried to go cold turkey a few few times, but found it difficult when she was smoking. Not her fault. But wow, it was instant when she came up with vaping. I owe my recovering health to her. 18 months fag-free from 30 odd a day.
We had a cheeky puff (to see if we still preferred cigs) after three weeks-stubbed and thrown out.