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"Negative effects can include paranoia, dry mouth, respiratory problems and nervousness/racing heart. Other effects may be negative or inconvenient in certain settings or situations including reduced ability to concentrate, impaired memory, tiredness, and confusion. Side effects tend to increase with lifetime use: as users age, they often report the anxiety-producing and uncomfortable effects increase and the euphoria decreases.
Contraindications #
Avoid Driving - While there has been little formal study into the effects of cannabis on driving, it is generally a good idea to avoid driving while under the influence of any psychoactive or intoxicating substance. Several studies have shown that drivers who use alcohol and cannabis in combination are far less capable than when taking either substance alone. Some studies have shown that cannabis causes impairment in driving performance, but that users often are aware of the impairment and compensate by driving more carefully.
Addiction Potential #
Regular use of cannabis can lead to psychological habituation for some people making it difficult for them to quit. Studies have estimated that between 5 and 10% of those who try smoking cannabis will become daily users sometime during their life, but most of these smokers will have given up the habit by age 30 and few remain daily smokers after age 40. Most people do not experience signs of physical addiction, but with regular daily use use, mild to medium withdrawal symptoms usually occur for less than a week, but can extend for as long as 6 weeks.
Long Term Health Problems #
The most common negative health impact of regular cannabis smoking are lung and throat problems including: coughing, increased frequency of throat and lung infections, and reduced lung capacity. There are concerns about possible long term carcinogenic (cancer causing) effects of cannabis smoking, but the results are still somewhat controversial. It can be safely said, however, that health risks increase with frequency and duration of smoking anything.
Risk of Death #
There are no confirmed, published death reports from cannabis-only poisoning. Especially given the wide use of cannabis, it appears that fatal reactions are approximately unheard of. There are a small number of people who report serious cannabis allergies which cause unexpectedly intense reactions, throat & lung irritation, etc.
Heart Issues #
Because cannabis increases heart rate, it could potentially increase risks of heart problems in those at risk of heart disease. One study found that cannabis use increased the risk of heart attack in men over 40, but its findings were weak and based on a very small number of individuals. In a large study of 65,000 individuals in California by Sidney et al in 1997, cannabis was not found to increase mortality rates among users under 50.
Mental Illness #
For those with schizophrenia, paranoia, or symptoms of psychosis, the use of cannabis, alcohol, and other recreational drugs can contribute to worsening symptoms and a decline in normal functioning. It is less clear whether cannabis causes asymptomatic--or otherwise healthy--people more than temporary paranoia and anxiety, though several major studies have documented an association between the use of cannabis by young people and later diagnosis of psychotic disorders. Those with a family history of psychotic disorders or who are otherwise predisposed to mental illness may be at increased risk of problematic mental health issues if they use cannabis."
http://www.erowid.org/plants/cannabi...s_health.shtml
Now compare those to say alcohol and make your own risk-based decisions:
"Health Problems #
* Increase risk of oral, throat, colon, liver, and breast cancer [Boffetta P. 2006]
* Cirrhosis of the liver [Leon DA. 2006]
* Fetal alcohol syndrome if used by pregnant women in large quantities [Willford J 2006]
* Injuries from accidents, falls, motor vehicle accidents, etc
* Fatty Liver Disease [Surernti C, et al. 2003]
* Very high doses can lead to acute toxicity, coma, and death. [Yoon YH. 2003]"
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