Demand legalization of marijuana and to make april 20th a national holiday

Marijuana is clearly the best alternative against any of the drug on the market legal or illegal it is also a known fact that it helps kills cancer cells, helps depression, anxiety, pain, arthritis,motion sickness, I can keep going there's numerous things that could be good for making paper, clothes, fuel. So why not make it legal across all the states for 21 and over for whatever use the person or persons use it for.