Smoking weed at least once a month is linked to an elevated risk of heart attack, according to a new study among nearly 160,000 people in the U.K.
The research, published in the journal Cell, looked at more than 11,000 people between the ages 40 and 69 who smoked weed at least once a month. The scientists then compared that group to 122,000 people in the same age bracket who did not smoke weed and nearly 23,000 more who smoked less frequently.
The study authors controlled for age, gender, and body mass index — three factors that influence the risk of heart disease — and found that people who smoked weed frequently were more likely than people who did not have a first heart attack before age 50. One heart attack increases the lifelong risk of having another or developing heart failure.