After 20 years or so of being a smoker, I just decided I didn't want to be embarrassed about the way I smelled in elevators anymore, and quit. I was a competitive cyclist, despite being a smoker, so it wasn't helping me in those social situations either.
When I did stop, it was hard for about a single day. Irritation and not being sure what to do with your hands are the biggest "withdrawal" symptoms you'll have from quitting. If I'd known just how easy it is to stop, I would have 10 years prior.
So yes, listen to the above poster. It won't kill you to quit, it will kill you not to. If you honestly think you can't, it's a very simple problem to solve. There are really only three components to quitting. Nicotine addiction (easy to taper off with substitutes like gums, switching to vaping with decrementing nicotine levels, etc), Habit (the act of smoking, vaping/e-cigarettes/gum chewing/going on walks instead can help replace this) and the social pressure, which is usually smoking with your smoker friends or partner. Fun fact, they all want to stop too, even if they don't say so. Get them to quit with you, and if one or more refuse or abandon, ignore them and be selfish with your health.
All that said - the "pain" of cold turkey lasts a day and all the anecdata that I've collected seems to make it the most effective way to stop.