Harmless marijuana:
1.) 3 to 5 times more tar and carbon monoxide than cigarettes (due to typical deeper inhalation and no filtering)
This is true except containing more tar doesn't mean it's more dangeorus. Marijuana contains THC which disrupts apoptotic pathway that cause cancer or other problems associated from the tar or carbon monoxide.
In laymen..the THC in marijuana counteracts the tar in it so that it's far less harmful tham tobacco. That's why people die from tobacco and not marijuana.
http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11485387&dopt=Abstract2.) Contains Benzyprene (carcinogen)
Again there's obviously some counteraction. The deat rate from Tobacco is over 400,000 a year in USA alone yet 0 from Marijuana. Meaning it's simply not dangerous.
3.) Impaired memory and ability to learn
Marijuana works differently on different people. Some people(Like the famous scientist carl sagan) are able to learn much better while on marijuana and compose their best works while using marijuana. Some others can hardly do basic math while using it. It depends on the person.
But the thing to remember is it's all TEMPORARY. Marijuana's effect is short term. The long term effects BENEFIT the brain.
Marijuana like chemicals spur braincell growth.
http://www.newscientist.com/article.ns?id=dn81555.) Anxiety attacks or feelings of paranoia
This is a very rare side effect occuring in a small number of people. Most who use marijuana get a feeling of eurphoria not paranoia.
6.) Impaired muscle coordination and judgment
I hardly see how this makes marijuana unhealthy. Just don't use it and drive and you'll be fine.
7.) Increased susceptibility to infections
This is a myth. There aren't any reliable studies on humans showing marijuana hurts the immune system. In fact marijuana is given to aids and cancer patients around the world to help them cope with pain. Marijuana..If it had any effect on the immune system would NOT be given to sick patients with damaged immune systems to begin with.
8.) Cardiac problems for people with heart disease or high blood pressure, because marijuana increases the heart rate
Evidence? Not that it increases heart rate but that there is a proven link between marijuana use and heart disease.
Johnny, it's irresponsible of you to say that's it benign, there are clearly health risks with smoking pot. I'm not saying it's lethal but there are definitely risks associated with it.
If there were health risks we should see people dead from it. We don't.