Steve T asked in HealthOther - Health · 6 years ago

Does Tobacco have more tar and nicotine than marijuana ?

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  • 6 years ago
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    Marijuana smoke and tobacco smoke share many characteristics with regard to chemical composition and toxicological properties. At least 33 individual constituents present in both marijuana smoke and tobacco smoke are already listed as carcinogens under Proposition 65. In examining the potential carcinogenicity of marijuana smoke, a range of information was evaluated. Studies of cancer risk in humans and laboratory animals exposed to marijuana smoke were reviewed. Other relevant data, including studies investigating genotoxicity and effects on endocrine function, cell signaling pathways, and immune function caused by marijuana smoke, were all considered. Also of interest were the similarities in chemical composition and in toxicological properties between marijuana smoke and tobacco smoke, and the presence of numerous carcinogens in marijuana smoke. The findings of all these reviews are summarized below. There is evidence from some epidemiological studies of people exposed to marijuana smoke suggestive of increased cancer risk from both direct and parental marijuana smoking. However, this evidence is limited by potential biases and small numbers of studies for most types of cancer. Studies reporting results for direct marijuana smoking have observed statistically significant associations with cancers of the lung, head and neck, bladder, brain, and testis. The strongest evidence of a causal association was for head and neck cancer, with two of three studies reporting statistically significant associations. The evidence was less strong but suggestive for lung cancer, with one of three studies conducted in populations that did not mix marijuana and tobacco reporting a significant association. Suggestive evidence also was seen for bladder cancer, with one of two studies reporting a significant association. For brain and testicular cancers, the single studies conducted of each of these endpoints reported significant associations. Among the epidemiological studies that reported results for parental marijuana smoking and childhood cancer, seven of eight found statistically significant associations. Maternal and paternal marijuana smoking were implicated, depending on the type of cancer. Childhood cancers that have been associated with maternal marijuana smoking are acute myeloid leukemia, neuroblastoma, brain astrocytoma, and rhabdomyosarcoma. Childhood cancers that have been associated with paternal marijuana smoking are leukemia, infant leukemia, acute lymphoblastic leukemia, and rhabdomyosarcoma. - http://life.umt.edu/curry/DOcs-SOS/Current%20Peer%...

    "A Canadian report says marijuana smoke contains more toxic compounds, including ammonia and hydrogen cyanide, than tobacco smoke. Researchers, including David Moir of the Safe Environments Program in Kitchener, Ontario, determined ammonia levels were 20 times higher in marijuana smoke than in tobacco smoke, while hydrogen cyanide, nitric oxide and certain aromatic amines occurred at levels 3-5 times higher in the marijuana smoke, Science Daily said Tuesday. The study was published in the Dec. 17 issue of American Chemical Society's journal Chemical Research in Toxicology." - http://www.upi.com/Science_News/2007/12/20/Toxic-c...

    The smoke from marijuana, the second most

    commonly smoked substance after tobacco, contains,

    in addition to THC, a large number of toxic

    gases and particulates (including high concentrations

    of procarcinogenic polycyclic aromatic hydrocarbons)

    that are capable of causing lung injury

    and potentially respiratory malignancy. Whereas

    THC produces short-term bronchodilation by relaxing

    airway smooth muscle, heavy habitual use

    of marijuana is associated with a number of adverse

    pulmonary consequences (table 1). These include

    1) symptoms of acute and chronic bronchitis,

    2) conflicting findings concerning the presence

    or absence of mild, progressive airflow obstruction,

    3) endoscopic and microscopic evidence of

    airway wall edema, vascular congestion and increased

    mucous secretion, 4) extensive histopathologic

    and immunohistochemical evidence of damage

    and dysregulated growth of the tracheobronchial

    epithelium, and 5) accumulation of increased

    numbers of alveolar macrophages that

    demonstrate impaired antimicrobial and tumoricidal

    function and impaired ability to generate immunostimulatory

    cytokines and inducible nitric

    oxide synthase and nitric oxide, an important effector

    molecule in microbial killing. These features

    raise concern that marijuana smoking may be

    a risk factor 1) for opportunistic infection, especially

    in already immunocompromised patients

    due to AIDS, organ transplanatation or cancer

    chemotherapy, and 2) for upper and lower respiratory tract cancer. http://archest.fsm.it/pne/pdf/63/2/pne63-2_tashkin...

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  • 6 years ago

    Yes. Marijuana has no nicotine at all. It has less tars but also you don't smoke nearly as much--I mean nobody smokes the equivalent of a pack or two a day of cigarettes.

    Cigarettes also have a lot of chemical additives that marijuana doesn't have. Cigarette companies extract the nicotine from stems and trimmings and spray it on the leaves used in the cigarettes to maintain the maximum addictive level of nicotine. Also they add chemicals to keep cigarettes lit (so if you light on and put it down it doesn't go out).

    If marijuana ever becomes legal and really popular, manufacturing companies will probably do that with marijuana too. Meanwhile, though, it's much more 'natural', just dried and sold as-is.

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