After 24 years or so, I stopped last year. I did the patch thing, and got through the 4 months of that without much trouble. After the patches, my nicotine cravings were really getting me down. I tried snuff, which once you have trained your nose not to sneeze every time was quite good, apart from when you blow your nose sometime later and it looks like you have just wiped your arse.
Then I tried the e-cigarette. The first guilt free draw as I got the back of the throat hit was bliss. I now use e-cigs all the time in place of smoking.
Which brand / type of device to use would take some explaining. I have tried several different combinations. Many are just like drawing fresh air. If you try one and think the same, it is important to note, you can get the liquids / cartridges in several different strengths from very strong, down to zero nicotine for those using them a physiological aid to help them stop smoking. Also, many different flavours. A lot will depend on whether you want to use them all the time and quit tobacco, or whether you want to half n half it as many do. I have friends who use them in the pub to cut down nipping outside, but still smoke as well.
Even though I refill my own cartridges, it is not as cheap as some may think. I used to smoke roll-ups which cost me around £!5 a week. I am paying around about the same now on e-fags.
Health wise, IMO, making the switch in your 40s is still well worth it. Your problem with smoking tobacco is you are using smoke to delivery your nicotine. This leaves tar in your lungs. The build of tar is the problem as we all know. If you stop smoking, the build up of tar will have completely cleared out of your lungs in around 15 years. With the e-cig, you are using vapour to deliver your nicotine which leaves no tar.
Downsides, being dependant on your kit. Leave it at work, in the pub, whatever, your in for a frustrating time till you get it back. Its not as if you can nip to the shop and get some more. Everything I get is mail order. Also, if you like to leave one in your kisser while you are typing posts on this forum, its a good idea to have a front tooth missing as these suckers are heavy, and the missing tooth makes a perfect purchase for them. -- just ask the main man !!!