Dagga smoking by itself probably does not lead to COPD.

Does smoking marijuana increase the risk of chronic obstructive pulmonary disease?
www.ncbi.nlm.nih.gov
Marijuana is the second most commonly smoked substance worldwide after tobacco.1 The constituents of marijuana smoke are qualitatively and, to a large extent, quantitatively similar to those of tobacco smoke, with the exceptions of Δ9-tetrahydrocannabinol (THC), found only in marijuana, and nicotine… …read more