The study in question: "Our meta-analyses suggest that children living in a home with gas cooking have a 42% increased risk of having current asthma, a 24% incr

The study in question: "Our meta-analyses suggest that children living in a home with gas cooking have a 42% increased risk of having current asthma, a 24% increased risk of lifetime asthma and an overall 32% increased risk of having current and lifetime asthma." https://academic.oup.com/ije/article/42/6/1724/737113 https://academic.oup.com/ije/article/42/6/1724/737113 To me, a 24% increase in risk of lifetime asthma is significant and well worth avoiding both at an individual level and a societal level, given that good alternatives are readily available. Given this 24% number, I guess the "1.5 percentage points" you quoted must be the absolute increase in asthma prevalence across the population, i.e. gas stoves in every home would cause 1.5% of people to develop asthma (when they otherwise wouldn't have it). That seems quite bad actually. If true, not using gas stoves (currently in 35% of households) could have prevented over a million cases of asthma in the US alone.