Everything takes time. Nothing happens all of a sudden; niether good nor bad; the way ice takes time to melt.
People specializes into anything only by practising regularly. That is how a systematic routine brings in the best of results by compounding regular benefits. Like regularly investing builds great wealth.
Similarly any bad habit can finally destroy anyone. Smoking ultimately causes cancer as every cigarette contributes towards that. That is how the compounding effect gets built up for anything.