Is spontaneous smoking cessation always a precursory symptom of lung cancer?

I've been a heavy smoker for nine years and I've tried and failed to quit many times. However, as of lately I started to find cigarettes gross and unappealing and have even cut back with ease. I've thrown away my smokes and lighters a few times recently but occasionally bought a pack for a couple of cigs before throwing them out again. Anyway, today I've been smoke free for 8 days with negligible symptoms which I find strange. I Googled spontaneous smoking cessation and Google said that it's an early sign of lung cancer. Am I doomed or might I be overreacting? I was really feeling good about myself and now I'm feeling a little freaked out. Any serious advice or help please.