Wow, this is a magically irresponsible headline by BBC, especially considering the rest of the article. Without a quantifier, the implication is that all damage

Wow, this is a magically irresponsible headline by BBC, especially considering the rest of the article. Without a quantifier, the implication is that all damage is healed, which further down is refuted by the buried lede: > In people who quit, up to 40% of their cells looked just like those from people who had never smoked. Or, at least 60% of the lungs still resembled the lungs of a current smoker.