Smoke 'em if you got 'em.
... [F]or the first time, a clear majority of Americans (58%) say the drug should be legalized. This is in sharp contrast to the time Gallup first asked the question in 1969, when only 12% favored legalization. [...]
The jump in support for legalization has occurred largely among independents [...]
Americans 65 and older are the only age group that still opposes legalizing marijuana. Still, support among this group has jumped 14 percentage points since 2011. ... 67% of Americans aged 18 to 29 back legalization. Clear majorities of Americans aged 30 to 64 also favor legalization. [...]
With Americans' support for legalization quadrupling since 1969, and localities on the East Coast such as Portland, Maine, considering a symbolic referendum to legalize marijuana, it is clear that interest in this drug and these issues will remain elevated in the foreseeable future.
More details and poll numbers at the link.