Where cannabis is legal

US

1. Colorado: recreational marijuana is legal but you cannot smoke it out of doors. You must be inside. 
2. Michigan: medical M is legal but you need a medical marijuana card (MMD) from a doctor. 

Canada

1. British Columbia: It is technically illegal to carry cannabis without a medical license in British Columbia but laws are not enforced generally if one is caught with less than a quarter of an ounce. The BC cannabis industry is brings in a huge $6 billion annually, making bud one of the most valuable cash crops in the area.
2. Vancouver: draws many tourists to its medical and legal marijuana markets. 

Amsterdam, Holland. There are marijuana cafes.

Australia has legalized cannabis and has a pot culture in certain towns. Pot enthusiasts from all over the world are attracted to the annual MardiGrass festival in Nimbin, New South Wales.

Prague: very liberal drug laws where many drugs are decriminalized.

Spain: one of the first European countries to legalize marijuana.

Source
MMU. May 18, 2016.

Another article: Kratom and CBD need protection from overreach of FDA hysterics.

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1. Ban organophosphates which hurts kids and adults alike.
2. Make coal companies clean up their mess when they leave a mine just like citizens have to. 
3. Allow more studies on the benefits of marijuana and CBD. Reschedule 420. Cannabis and CBD work for things like certain types of pain, anxiety, depression, we just need to know more about dosing, side effects, and interactions with other drugs.

National Cancer Institutes admits marijuana kills cancer cells

Marijuana has been under a hysterical attack by the US gov't for decades now. Ask yourself, how many people high on pot have actually robbed a liquor store? None. How many people have died from an overdose of pot? None.

The US NCI now admits marijuana kills cancer cells. A direct link to an image of the site for backup.

The US makes it hard to even study the effects of pot, Europe has done more on this than the US. Don't expect the US to move forward with this. More studies need to be done about how it can be administered for each problem it solves.

More studies about pot from PubMed. Some may just be abstracts. On each abstract page look in the upper right of the page for "Full Text Links" and "View Full Text". Some abstracts have free full text on another website. Screenshot here of where "Full Text Links" is.

Free full studies about marijuana from PLOS.org.