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Each potential participant was informed about the procedures and the objectives of the study and those who accepted to participate provided written informed consent for the collection and utilization of biological specimens

Here's what they found, as reported by Christopher Ingraham at The Washington Post , who says weed came out roughly 114 times less deadly than alcohol, according to the margin of exposure: In fact, of all the drugs analysed, marijuana was the only one that could be classified as having a 'low mortality risk', while alcohol and tobacco were classified as 'high risk' substances

This may be bad for some farmers

In addition, cigarette smoke is associated with other chronic pulmonary diseases such as pulmonary edema, chronic bronchitis, and pulmonary emphysema, the last two also termed chronic obstructive pulmonary disease (COPD)