does smoking cigarettes decrease milk supply Quitting During Pregnancy And Beyond – Breastfeeding and Medication Smoking and Breastfeeding

There is no "safe" level and way of smoking during pregnancy

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The most evident benefit from stopping smoking appears in the condition of your lungs

There might be older brands but they are not well documented

15 Years: Overall Mortality Risk Normalises Fifteen years after quitting smoking, your risk of coronary heart disease and overall mortality returns to nearly that of a lifelong non-smoker

CO prevents the maturation of dendritic cells and lowers the production of pro-inflammatory cytokines and the proliferation of effector T cells, whereas it stimulates the secretion of the anti-inflammatory cytokine IL-10 which may explain the beneficial effects in UC [51]