Don't recall the month, but early in 1971 for me. I had a terrible sore throat and could not smoke for a couple of days, then decided to see how long I could go without. No relapses yet!
I had smoked regular Winstons, then gold Winston Lights, then Winston Ultra Lights. The Ultra Lights had so many perforations that I was drawing more air than smoke (and as a result, smoking more.)
The nice new Chevy was all it took. I found two smokes in my last pack and smoked one after dinner and had one after breakfast the next day. It might have been some self hypnosis or auto suggestion but I got through it just fine.