cancer chemicals in cigarettes How does smoking cause cancer? Smokeless tobacco and cigarette smoking:

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A major criticism in reporting of cannabis-related and smoking-related pneumothorax has been the absence of standardised information about smoking habits in case reports and cohort studies.31 32 38 39 Recognising similar problems in addiction research, the European Centre for Drugs and Drug Addiction (EMCDDA) recommended the use of standard questionnaires in 2002.40 The EMCDDA questionnaire has been used in a large Danish cohort study to establish cannabis as a risk factor for PSP,35 but the EMCDDA questionnaire has not yet been updated to include assessments of e-cigarette use

It may also spread to different areas of the body if left untreated

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