The 48-year-old singer, real name David Emmanuel, died from a single stab wound to the heart while police executed a search warrant at his Surrey home on March 15 2011.
The jury of five men and six women took 12 hours and 52 minutes to reach their majority verdict.
The jury foreman said:
"David Victor Emmanuel took his own life. Although the tragic events of 15 March 2011 were unforeseeable, giving one officer the responsibility of supervising Mr Emmanuel and at the same time the premises search book was a contributory factor in his death."
The inquest heard that he stabbed himself after being arrested at the property in Warlingham.
The police inquiries concerned allegations of conspiring to import class A drugs into the UK, the court heard.
Surrey Coroner Richard Travers said he was he would make a report to the Metropolitan Police on changes or improvements to the supervision of a prisoner at their home during a search.
Smiley Culture found fame with a string of 1980s hits including CockneyTranslation, and appeared on Top of the Pops.
The inquest, which began on June 12, took place at Woking Borough Council's Civic Offices.
It's the third day of evidence in the full inquest into the death of musician Smiley Culture, real name David Emmanuel. Mr Emmanuel died from a stab wound to the heart as his home was raided by police.
The police officer who was present when he died, referred to as Witness 2 for legal reasons, is expected to give evidence today.