The answer, like Walt himself, is a volatile mixture of science, psychology, and choice. On a purely literal level, the show provides a plausible, if subtle, explanation. In Season 2, during a tense argument with his wife Skyler, Walt reveals a crucial piece of his past: he left Gray Matter Technologies, the multi-billion dollar company he co-founded.
Science says: Because he worked with dangerous chemicals without proper protection decades ago. Karma says: Because he spent twenty years marinating in his own pride and fear until his body rotted from the inside. Tragedy says: Because if he hadn't gotten cancer, he would have remained a frustrated, safe, miserable man—and the world would have been better for it. why did walter white get cancer
However, by the end of the series, we learn the devastating twist: the cancer goes into remission. The excuse evaporates. Walt could have stopped. He could have taken the money, hugged his family, and died a hero. But he didn't. He kept cooking. The answer, like Walt himself, is a volatile