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No asymmetrical pattern was observed in the comparison-adjusted funnel plots for all outcomes, suggesting no publication bias (Supplementary file Figures 35)

Cigarettes are smoked by some with a cigarette holder.The main health risks in tobacco pertain to diseases of the cardiovascular system, in particular myocardial infarction (heart attack), cardiovascular disease, diseases of the respiratory tract such as Chronic Obstructive Pulmonary Disease (COPD), asthma, emphysema, and cancer, particularly lung cancer and cancers of the larynx and tongue.

Even minimal exposure to secondhand cannabis smoke can have perceptible effects, though the smokes impact can vary depending on factors such as its concentration, the duration of exposure, and the ventilation of the environment

The chemical name is 4-phosphoryloxy-N,N-dimethyltryptamine (4-PO-DMT), and the molecular formula is CHNOP