While the underlying reasons for an aging population of cannabis users are yet to be singled out, the prolonged use of cannabis might be associated with an increase in the risk of lung cancer [62] or chronic obstructive pulmonary disease [13] – both of which are rather rare among younger adults. Moreover, acute cannabis use is a risk factor for traffic collisions [63,64] and this affects all ages regardless of the purpose of use (recreational or medical) [65]. Thus, if the aging and growing population of cannabis users are driving under the influence of cannabis, this could increase the number of motor vehicle accidents in Europe.
