Society for the Study of Addiction Jul 31 2025 A new study has found that, among women with a high desire to avoid becoming pregnant, those who drank heavily had a 50% higher risk of becoming pregnant than those who drank moderately or not at all. In contrast, participants who used cannabis were no more likely to have an undesired pregnancy than participants who did not use cannabis. From a larger sample of over 2,000 non-pregnant women aged 15-34, researchers identified a subgroup of 936 who