Green’s Dictionary of Slang

1. the sweating that is one of a heroin addict’s withdrawal symptoms.

1993

I. Welsh Trainspotting 16: The auld sweats arrive on cue, and lets not forget the shivers.

2. sweating that accompanies excessive use of cocaine.

1998		(con. 1986) G. Pelecanos Sweet Forever 79: I do believe our mayor got a case of the cocaine sweats.
2000		Indep. Mag. 22 Jan. 12: The drug-induced chest pains, night sweats and panic attacks Noel had started suffering.