I know that withdrawal from alcohol can cause fatal seizures and heart attacks from completely physical medical reasons, without regard to one's degree of mindfulness.
But mindfulness as a means to stay booze and tobacco free? Absolutely.
It's only the fear of not smoking thirty seconds from now or five minutes from now or an hour from now or forever that causes me discomfort. But not having a cigarette in this instant - easiest thing I've ever done.
Beautiful. Anyone can quit for a moment, for a minute, maybe even for a day. But forever? It is fear that stops us from making this commitment. We only need to never now drink.