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Cannabinoids and psychosis.D'Souza DC.
Department of Psychiatry, Yale University School of Medicine, VA Connecticut Healthcare System, West-Haven, Connecticut 06516, USA.
Recent epidemiological studies and advances in understanding of brain cannabinoid function have renewed interest in the long-recognized association between cannabinoids and psychosis. This chapter presents evidence supporting and refuting the association between cannabinoids and psychosis. Cannabinoids can induce acute transient psychotic symptoms or an acute psychosis in some individuals.
There is also tantalizing evidence from postmortem, neurochemical, and genetic studies suggesting CB1 receptor dysfunction (endogenous hypothesis) in schizophrenia that warrants further investigation. Further work is necessary to identify those factors that place individuals at higher risk for cannabinoid-related psychosis, to identify the biological mechanisms underlying the risks and to further study whether CB1 receptor dysfunction contributes to the pathophysiology of psychotic disorders.
Vtora studija:
[Bronchial mucoepidermoid carcinoma in a 22 year-old cannabis smoker][Article in French]
Lebeau B, Gјnot C.
Service de pneumologie, Hфpital St-Antoine, AP-HP, Universitј Paris VI.
bernard.lebeau@sat.ap-hop-paris.fr
INTRODUCTION: Bronchial mucoepidermoid carcinoma represents less than 0.5% of malignant bronchopulmonary cancers. The factors of risk have not been clearly established. Consumption of cannabis could be incriminated, as is suggested by this case report. OBSERVATION: A 22 year-old man presented with a mucoepidermoid carcinoma of the middle bronchopulmonary lobe. This young man had consumed large quantities of tobacco and cannabis since the age of eleven. DISCUSSION: The relationship between this rare tumour and the addictions in this patient merit further discussion. The oncogenic role of cannabis smoke should be envisaged, and emphasis placed on the possible synergic effects of multiple addiction, in this case tobacco and cannabis.
Treta studija:
Epidemiologic review of marijuana use and cancer risk.Hashibe M, Straif K, Tashkin DP, Morgenstern H, Greenland S, Zhang ZF.
International Agency for Research on Cancer, 69008 Lyon, France.
Marijuana is the most commonly used illegal drug in the United States and is considered by young adults to be the illicit drug with the least risk. On the other hand, marijuana smoke contains several of the same carcinogens and co-carcinogens as the tar from tobacco, raising concerns that smoking of marijuana may be a risk factor for tobacco-related cancers. We reviewed two cohort studies and 14 case-control studies with assessment of the association of marijuana use and cancer risk. In the cohort studies, increased risks of lung or colorectal cancer due to marijuana smoking were not observed, but increased risks of prostate and cervical cancers among non-tobacco smokers, as well as adult-onset glioma among tobacco and non-tobacco smokers, were observed. The 14 case-control studies included four studies on head and neck cancers, two studies on lung cancer, two studies on non-Hodgkin's lymphoma, one study on anal cancer, one study on penile cancer, and four studies on childhood cancers with assessment of parental exposures. Zhang and colleagues reported that marijuana use may increase risk of head and neck cancers in a hospital-based case-control study in the United States, with dose-response relations for both frequency and duration of use. However, Rosenblatt and co-workers reported no association between oral cancer and marijuana use in a population-based case-control study. An eightfold increase in risk among marijuana users was observed in a lung cancer study in Tunisia. However, there was no assessment of the dose response, and marijuana may have been mixed with tobacco. Parental marijuana use during gestation was associated with increased risks of childhood leukemia, astrocytoma, and rhabdomyosarcoma, but dose-response relations were not assessed.
Clinical consequences of marijuana.Khalsa JH, Genser S, Francis H, Martin B.
Center on AIDS and Other Medical Consequences of Drug Abuse, National Institute on Drug Abuse, National Institutes of Health, Bethesda, Maryland 20892, USA.
As documented in national surveys, for the past several years, marijuana has been the most commonly abused drug in the United States, with approximately 6% of the population 12 years and older having used the drug in the month prior to interview. The use of marijuana is not without significant health hazards. Marijuana is associated with effects on almost every organ system in the body, ranging from the central nervous system to the cardiovascular, endocrine, respiratory/pulmonary, and immune systems. Research presented in this special supplement will show that in addition to marijuana abuse/dependence, marijuana use is associated in some studies with impairment of cognitive function in the young and old, fetal and developmental consequences, cardiovascular effects (heart rate and blood pressure changes), respiratory/pulmonary complications such as chronic cough and emphysema, impaired immune function leading to vulnerability to and increased infections, and the risk of developing head, neck, and/or lung cancer. In general, acute effects are better studied than those of chronic use, and more studies are needed that focus on disentangling effects of marijuana from those of other drugs and adverse environmental conditions.
[Cannabis and cancer][Article in French]
Carriot F, Sasco AJ.
Unitј d'Epidјmiologie pour la Prјvention du Cancer, Centre International de Recherche sur le Cancer, 150, cours Albert Thomas, 69372 Lyon Cedex 8, France.
Several publications have recently suggested a relationship between cannabis use and certain types of cancer. We gathered information on the latest findings on the subject. A manual and computerized bibliographic search on cannabis and cancer was conducted. In users under 40 years of age, cannabis is suspected to increase the risk of squamous-cell carcinoma of the upper aerodigestive tract, particularly of the tongue and larynx, and possibly of lung. Other tumours being suspected are non-lymphoblastic acute leukaemia and astrocytoma. In head and neck cancer, carcinogenicity was observed for regular (i.e. more than once a day for years) cannabis smokers. Moreover, cannabis increases the risk of head and neck cancer in a dose-response manner for frequency and duration of use. Interaction was observed with cigarette smoking and alcohol use. Delta9-THC seems to have a specific carcinogenic effect different from that of the pyrolysis products.
