And financially, you save.
Ready rolled ciggies are about £6 for 20 here in the UK (assuming you are buying here and not buying fake ciggies on the black market which are m,uch more toxic)
If you smoke 20 a day......
£6 per day
£42 per week - (more likely £60 per week if you go out and offer ciggies to friends when you light up)
£2190 a year (based on £6 per day or closer to £3000 if you do the socialising thing above)
OMG - you could buy a nice guitar, amp, or secondhand car with that much money
Yeah, I smoke roll-ups (out of preference), but I still spend around £18 a week on it.
Strangely though, at least one of my guitars was funded on calculated savings from stopping smoking. However, for me anyway, you can always find money for cigarettes if you want to. So I can't make the financial side work as a motivator - I have known some who managed it though.
The trigger for quitting for me is: I'm not enjoying it, I feel sh1t every morning because I'm smoking too much, it's obviously killing me, and it seems to be controlling me more than I'm comfortable with (ie I end up with a lit fag without having consciously decided to have one), etc...
When all that builds up together and I find myself not even liking the first puff on cigarette, then I know I'm in the right position to stop again.
I think the main thing is not to get too stressed about it. In a relaxed way you can go "I don't need to do this if I don't want to...". We've all got a lot more willpower than we realise if it's backed up by what we want.