First of all, I do not know of any person that has been addicted to nicotine that the commercials, medical warnings, etc. have seriously swayed them. This should tell you what a stronghold nicotine can be on a person...the fact that knowing all of this and yet, still being so difficult to quit. For those who have never experienced this addiction, think about this for a moment. For the person who is addicted to nicotine, lets say smoking for example, there is no 'high' associated with it like other forms of drug addictions, it turns everything yellow, makes you smell like an ash tray, is terrible for your health, and not to mention most of society frowns upon it. And, some might even say this is the hardest addiction to break.
My mother was a smoker and I complained about it to her to no avail. Then ironically, I picked up the habit while driving to stay awake on long drives after I fell asleep at the wheel and totaled my car one night. I see it from both perspectives now. I feel a great deal of compassion for those trying to quit and can understand how difficult it can be. But it can be done
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On my previous attempts at quitting, the 1st 3 days are the most difficult for some reason. Drinking lots of water, and water with lemon seemed to help when I wanted a cig. I would also take deep breaths and tell myself, that if I really wanted one that bad, in 10 minutes I would have one,..and funny enough the urge would pass within that time. I had to change up triggers like chewing gum in the car, chewing on straws, etc. I even put a rubber band on my wrist and snapped it really hard when I thought about smoking (this was a tip from someone lol). But it did get easier as time passed.
But, then I would fall of the wagon and repeat the cycle of trying to quit. And then, God stepped in. Cold turkey. Working through prayer and giving it up to Him has changed things entirely. I found that my desire for smoking diminished immensely. Interestingly, for many smokers, coffee goes hand in hand and can be another trigger, and I stopped wanting to drink coffee in the morning first which is unheard of for me. I suppose God was helping me get ready to drop the ciggies.
So, to the O.P., take it one day at a time. Pray and ask God for help. And know that it does get better each and every day