Weed track makes me think young people in service industry jobs who are much more socially/politically progressive compared to their economic peers. Like the staff at a Lush or a grocery co-op.
Put a high premium on relatability in their candidates and some are a little bitter at having to accept a worse standard of living then their parents.
I think there's a large contingency of middle-aged (40-60) white working class men who would fit this bill too.
Defining feature of a "weed track" voter probably would be sparse interest in politics. Probably more socially progressive (but not always) but engaging less with politics aside from superstar politicians like Obama, Sanders, and maybe Trump. Probably more excited to vote in the 2020 primaries than in the 2020 general, and unlikely vote (or have especially strong opinions) a referendum for medicaid expansion or increasing gasoline taxes.