Pew Research did the poll.
Pew found that 52 percent of Americans said marijuana use should be legal, compared to just 45 percent who said it should be illegal. The level of support has jumped 11 percentage points in the last three years.
Support is even higher among younger American adults, with nearly two-thirds of Millennials — those born since 1980 — supporting legalization…
The biggest change is support appears in recent years is a shift away from people viewing marijuana use as a moral issue. Just seven years ago, 50 percent said smoking pot was morally wrong. Now, only 32 percent say that, while a full 50 percent say pot use isn’t a moral issue one way or the other.