1) People will grow their own, the price will go way down (hint: pot heads are cheap.)
2) Latin American countries will also legalize and soon export to Kanadastan for a low price.
3) Outdoor is always superior to indoor. No one needs indoor anymore.
4) Weed can last for 1-2 years in the freezer no problem. It will be 1kg of shatter for $100usd from Ecuador via CPC. 
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Conclusion
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5) These stocks will be worthless in 5 year.s