1) what are side effects (bad side) of marijuana?

2) what would happen if everyone in Canada smoke marijuana?

For my opinion and the answer for 2)would be Canadians would go crazy!

2 answers

https://www.inspiremalibu.com/blog/drug-addiction/11-negative-side-effects-of-using-marijuana/

Just as few people smoke cigarettes, so even less smoke marijuana now.
You asked the same question a few days ago
https://www.jiskha.com/questions/1784614/if-justin-trudeau-legalized-all-the-drugs-in-the-canada-what-will-happen-to-canada