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Twenty-three-year-olds should not be out of breath at an exercise intensity equivalent to a moderate walk. We initially collected data on just a few e-cigarette users, as we were doing similar work examining pulmonary blood flow in elderly patients with smoking-induced lung damage, explains Thomas Williams, the graduate student who was first author on the study

Lead is notorious for causing neurological and cardiovascular issues

Cannabis, tobacco and the hippocampus A widely-reported recent study correlated long-term heavy cannabis use with reduced volume and density of the hippocampus, an area of the brain that is associated with memory, inhibition and addiction

The stamp in the illustration at right is from series 107, 1937