I did that 30 years ago (oi—I am old), and it was truly HARD. What really helped was a note card I rolled up like a cigarette and used just to give me the comfort of inhaling.
Felt silly every time I used it, but am convinced it did help me to quit “cold turkey”!
Now, living in S. Oregon where the smoke has hidden blue skies for months, I am so grateful I did quit because the smoke hasn’t bothered me at all!