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the reason they say that is, there are more carcinogens in cannabis than in tobacco.
but they don't tell you that the ones in tobacco are more damaging, and are higher in quantity because you smoke a hell of alot more tobacco every day than you do weed. unless you're rich and smoke a massive 2 ounce joint every day :jointsmile:
Here's the abstract, cannabis use actually was linked to only one case of emphysema, while tobacco use, or tobacco use plus cannabis use was linked to lots of emphysema.
THE EFFECTS OF CANNABIS ON PULMONARY STRUCTURE, FUNCTION AND SYMPTOMS.
Aldington S, Williams M, Nowitz M, Weatherall M, Pritchard A, McNaughton A, Robinson G, Beasley R.
Medical Research Institute of New Zealand, New Zealand.
BACKGROUND: Cannabis is the most widely used illegal drug worldwide. Long term use of cannabis is known to cause chronic bronchitis and airflow obstruction, however the frequency of macroscopic emphysema, the dose-response relationship and the dose equivalence of cannabis with tobacco has not been determined. METHODS: A convenience sample of adults from the Greater Wellington Region was recruited into four smoking groups; cannabis only, tobacco only, combined cannabis and tobacco and non-smokers of either substance. Their respiratory status was assessed using high resolution CT scanning, pulmonary function tests and a respiratory and smoking questionnaire. Associations between respiratory status and cannabis use were examined by analysis of covariance and logistic regression. RESULTS: A total of 339 subjects were recruited into the four groups. A dose-response relationship was found between cannabis smoking and reduced FEV1/FVC and sGaw, and increased TLC. For measures of airflow obstruction, one cannabis joint had a similar effect to between 2.5 and 6 tobacco cigarettes. Cannabis smoking was associated with decreased lung density on HRCT scans. Macroscopic emphysema was detected in 1/75 (1.3%), 15/92 (16.3%), 17/91 (18.9%) and 0/81 subjects in the cannabis only, combined cannabis and tobacco, tobacco alone and non-smoking groups respectively. CONCLUSIONS: Smoking cannabis was associated with a dose-related impairment of large airways function resulting in airflow obstruction and hyperinflation. In contrast, cannabis smoking was seldom associated with macroscopic emphysema. The 1:2.5 to 6 dose equivalence between cannabis joints and tobacco cigarettes for adverse effects on lung function is of major public health significance.
PMID: 17666437 [PubMed - as supplied by publisher]
From Granny's "Birthday Gift" post-
Cannabis Smoke and Cancer: Assessing the Risk
Cannabis Smoke and Cancer: Assessing the Risk - NORML
Cannabis and tobacco smoke are not equally carcinogenic
Cannabis and tobacco smoke are not equally carcinogenic
Smoking Marijuana Does Not Cause Lung Cancer
US: Web: Study: Smoking Marijuana Does Not Cause Lung Cancer
Tobacco and marijuana use on offspring growth from birth through 3 years of age.
The effects of prenatal tobacco and marijuana use ...[Neurotoxicol Teratol. 1992 Nov-Dec] - PubMed Result
Progression from marijuana use to daily smoking and nicotine dependence
Erowid.org: Erowid Reference 6951 : Progression from marijuana use to daily smoking and nicotine dependence in a national sample of U.S. adolescents : Timberlake DS, Haberstick BC, Hopfer CJ, Bricker J, Sakai JT, Lessem JM, Hewitt JK
High anxieties - What the WHO doesn't want you to know about cannabis
High anxieties - What the WHO doesn't want you to know about cannabis - 21 February 1998 - New Scientist
Radioactive tobacco
Radioactive tobacco
Nuff said!- Granny:hippy:
It is all bullshit. they are just trying to scare people