Embattled Toronto Mayor Rob Ford has said he cannot guarantee he will stay sober if he is re-elected, telling a radio show that people will have to trust him.

Mr Ford, who returned this week to City Council from two months in rehab, said in an interview on Newstalk 1010 that he cannot make promises about something over which he has "no control".

Radio host Jerry Agar said that as someone who has supported Mr Ford in the past, the lack of guarantees that he will not drink again if re-elected makes it tough to "take another four-year shot on Rob Ford".

"That's up to you," Mr Ford replied. "You're going to have to look at my record and compare it to the people I'm running (against) and you're basically going to have to trust me."

Mr Ford insisted that returning to lead Canada's largest city and run for re-election on October 27 will not compromise his recovery.

Mr Ford said earlier this week that he has used "every drug you can probably think of," and blamed substance abuse for the racist and homophobic language he has used.

He said he has used cocaine, marijuana and hallucinogenic mushrooms, but not heroin. He acknowledged he smoked crack but denied he was a crack addict. He said he drank at City Hall, but never did drugs at work.

The mayor announced in late April that he would seek help for alcohol addiction after a video surfaced that apparently showed him smoking crack cocaine. Reports last year of a similar video led to months of denials before Mr Ford made his statement about smoking crack in a "drunken stupor".

A small group of protesters, inspired by Joe Killoran, a shirtless jogger whose rant at Mr Ford during a Canada Day event on July 1 touched off a social media frenzy, gathered outside the radio studios.

"We have no shirts, you have no ethics," read one sign carried by the protesters, many of whom were bare chested.

Since his return Mr Ford has given a handful of interviews, but has refused to take questions from city hall journalists about the circumstances surrounding his alcohol and drug use, the company he kept and offensive remarks he has made.

Sign up to our free newsletters

Get the best updates straight to your inbox:
Please select at least one mailing list.

You can unsubscribe at any time by clicking the link in the footer of our emails. We use Mailchimp as our marketing platform. By subscribing, you acknowledge that your information will be transferred to Mailchimp for processing.