Queensland shops raided after cannabis deaths

Four Queensland adult stores have been raided after an investigation into a batch of synthetic cannabis that claimed two lives.

Detectives on Thursday searched businesses in Mackay, Rockhampton, Bundaberg and Toowoomba that were believed to be selling the synthetic drug.

No arrests had been made but shop owners were being spoken to, a police spokesman told AAP.

The businesses were part of the same franchise.

Two men, aged 33 and 41, have died in central Queensland in the past two days from poisoning believed to be linked to synthetic cannabis.

The men did not know each another.

Mackay health authorities have warned of a recent increase in the number of hospital patients complaining of adverse effects associated with the synthetics.

The fatalities prompted police to warn that synthetic drugs, commonly bought over the internet, are covered under drugs misuse legislation.