This is a myth. Smoking marijuana might actually be negatively correlated with lung cancer for long term users. Regardless, it&#x27;s certainly not associated with increased lung cancer or increased risk for COPD. You and others who are misinformed should stop spreading around these ridiculous lies and look at the science:<p>&quot;Although marijuana smoke contains a number of carcinogens and cocarcinogens, findings from a limited number of well-designed epidemiological studies do not suggest an increased risk for the development of either lung or upper airway cancer from light or moderate use, although evidence is mixed concerning possible carcinogenic risks of heavy, long-term use.&quot; -- <a href="http:&#x2F;&#x2F;www.ncbi.nlm.nih.gov&#x2F;pubmed&#x2F;23802821" rel="nofollow">http:&#x2F;&#x2F;www.ncbi.nlm.nih.gov&#x2F;pubmed&#x2F;23802821</a>