This report—the Cannabis is a greenish or brownish that cannabis smoking was linked fourth in a series reviewing the effects to lower lung density and greater of cannabis use on various aspects of material consisting of the dried human functioning and development flowering, fruiting tops and leaves of total lung capacity, associations that were not found with tobacco (see Beirness & Porath-Waller, [...] In Porath-Waller, 2015; Porath-Waller, Hashish or cannabis resin is the dried addition, the study results showed no 2009)—provides an update on brown or black resinous secretion of significant change or decline in clinical the topic of the respiratory effects the flowering tops of the cannabis measures of exhalation capacity in of cannabis smoking. [...] It is a controlled Smoking Contrast between Cannabis and Tobacco substance under the Controlled Drugs Prior to outlining the evidence related Smoke and Substances Act—meaning that to the respiratory effects of cannabis, the acts of growing, possessing, it is important to acknowledge that Several reports have drawn distributing and selling cannabis there have been a number of issues comparisons bet [...] Despite the evidence for a link between cannabis smoking and a wide range of respiratory symptoms, research on Other respiratory conditions in relation to cannabis smoking the relationship between cannabis and COPD is unclear. [...] The state of research on cannabis smoking of exposure there was no evidence of adverse effects, and respiratory conditions is too limited to provide estimates whereas among heavy users decreases in air function were of the prevalence of these and other serious health threats.