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Global Affairs Canada (GAC) has set additional limits on the quantity and/or dollar value of certain food products you can bring into Canada duty-free or that you can include in your personal exemption

Based on a review of 79 prospective studies, It was found that exposure to pre- or postnatal passive smoke exposure was associated with a 30% to 70% increased risk of incident wheezing (strongest effect from postnatal maternal smoking on wheeze in children aged # 2 years, Odds Ratio (OR) = 1.70, 95% CI = 1.242.35, 4 studies) and a 21% to 85% increase in incident asthma (strongest effect from prenatal maternal smoking on asthma in children aged # 2 years, Odds Ratio (OR) = 1.85, 95% CI = 1.352.53, 5 studies)

PLoS ONE 11 (3), e0150383 (2016)

Air exposure pulls out that original, moist charm, leaving you with what we affectionately call a stale cigarette. So while they technically dont expire in the way milk or eggs would, theres a real drop-off point in quality