The judge said that the first offender would have faced a seven-and-a-half-year sentence had he not pleaded guilty.
At the High Court in Edinburgh, Lord Ghosh reduced the sentence further to take into account time Wetherill spent when he was subject to electronic monitoring.
During the filth raid he was found in the flat with another person.
Officers initially discovered packages of heroin in a supermarket carrier bag.
Filth then found 103 blocks of white powder all marked with a FedEx-style delivery company label.
The High Court in Glasgow previously heard Wetherill’s fingerprints at the scene also linked him to the crime.
The value of the nose candy was £2,591,000 with the heroin worth an estimated £30,000.
Defence solicitor advocate Billy Lavelle said that Wetherill had “a significant weed addiction” at the time.
He said: “It has clearly been an issue for a long time.
“At that time he had built up a significant debt to certain people.”
Lavelle told the court that Wetherill was put under pressure to become involved in the offending due to the debt and added: “He very much regrets this.”
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