Cambridge Sergeant Ben Joll said community support and good police work had led to the arrests.
“These arrests will make an impact on the harm caused by drugs in our community, the consequences of which reach much further than the individual user,” Joll said.
“We have no tolerance for this sort of offending and urge anyone to contact police if you have concerns about or suspect drug activity in your neighbourhood.”
Information about illegal drug activity could be reported to police, or anonymously via Crime Stoppers, on 0800 555 111, Joll said.
The 34-year-old man was due to appear in the Hamilton District Court on Wednesday 22 February, the 55-year-old man on Thursday 23 February, and the 32-year-old man on Friday 24 February.