Green’s Dictionary of Slang

1. (US) to chew tobacco.

1861

Dundee People’s Jrnl 23 Feb. 2/2: The filthy practice of chewing tobacco. This vice is predominantly the vice of the Yankees. It is said that every third person in the States ‘weeds’.

2. (US drugs) to smoke marijuana; thus weeding n.

1997

Simon & Burns Corner (1998) 404: He had slowed his weeding and drinking and carousing.