Fig 2. Associations (expressed by regression coefficients with 95% CIs, BMI units (kg/m²)) of current smoking with BMI compared to never smokers (reference) in twin individuals (n = 156,593) and same-sex twin pairs (DZ or MZ pairs) discordant for their smoking status (m = 10,128 pairwise measurements) by sex and time period from the CODATwins database, 1960–2012.

BMI = body mass index; CI = confidence interval; DZ = dizygotic; MZ = monozygotic.