Nearly a century of marijuana prohibition came to an end last week .
Canada became the first major western Nation to legalize and regulate its sale and recreational use.
The change was praised by few People and Investors in this budding industry that saw a soar on the Toronto and New York Stock Exchange .
Health experts have raised concerns and questions to this decision.
Prime Minister Justin Trudeau said on the eve that it should be used wisely. Proper tracking is done on its sale.
Canada is the Second Country after Uruguay to legalize the drug.
The law requires purchasers to be at least 18 years and the amount they can carry at one time is 30 grams.