For anyone wanting to quit and feel better from the first day, without any cravings and issues I highly recommend "Easy way" from Alan Carr. It is short and very interesting, and you can find a free pdf version.

Literally the best possible way to quit smoking and open your eyes, which does not get any media coverage.

To whoever I recommended it, 90% stopped smoking. The issue is just if someone lights again "just one", because then they fall in the trap again.