You will successfully quit smoking if you drop "the last cigarette".
As a frequent smoking quitter, we always have the thought like, "after the last cigarette, I will quit". Then we smoke the "last cigarette" thoroughly, in an attached emotion. We feel like we are leaving the best friend. Later, for sure we pick up smoking again.
"Last cigarette" is a good example of the confusing of what nicotine tells you, and what your real thought is. The "last cigarette" illusion is what the nicotine creates in your mind, to let you feel that you are sacrificing some benefit, say smoking, to exchange for your health. But the truth is, you are not sacrificing anything by quitting smoking. It is easy if you consider nicotine addiction as an illness. For example, will you feel that you sacrifice something when you recover from a bad headache? Will you try to seriously feel the last piece of headache before it is totally removed from your head? Of course not. The only difference is that headache doesn't bring you the addiction but nicotine does.
Let me tell you my quiting story. I have the last cigarette left in my pocket when I was reading Allen's quit-smoking book. I was so inspired by the book at that moment and decided to quit. I held the last cigarette in my hand and thought, I will finish the last one enjoyingly then quit. However, I suddenly realized that THERE IS NO NEED TO SMOKE THE LAST ONE if I want quit. It is ridiculous that I decide to quit but insist to take the last one. How could the thought of smoke-the-last-one come up in my mind? Of course, it is what my nicotine in my body tells me. Then guess what, I threw my last cigarette in the trash, and feel very relieve. You can never get that kind of relief if you smoke the last one.
Smoking the last one will put something in your subconsciousness, that you are not actively quiting smoking, but are separated with smoking habit, your best friend, by some external force, say the concern to your health. But trashing the last one will make you feel that you actively leave smoking habit, instead of pushed away by some others.
Just trash the last one. After that you will be amazing of the whole new feeling that you never experienced before immediately after you quit, the feeling that is not depressing or losing something as you frequently felt in the past. It is a feeling of fulfillment and rebirth.
Go feel it!