Polanski said he had personally never taken drugs or drunk alcohol, adding that it “wasn’t for me”.
Asked why he had never drunk alcohol, he said: “I grew up in school where a lot of my friends were drinking and in fact taking drugs and it felt like somebody needed to be sober.
“I’ve always liked dancing without taking drink or drugs.
“If anyone wants to do it and they’re doing it safely fine, I’m glad people are having a good time.
“But we know lots of people aren’t doing it safely so let’s make sure they get the support they need.”
Asked whether he believed legalisation could send a message to young people that using drugs would be okay, Polanski replied: “I think the danger is happening right now which is where we’re pushing it into street corners and a black market.”
He pointed to the organisation Anyone’s Child, set up by families of those who had died due to drug use.
“They’re saying very clearly with one voice we need a national conversation about how the war on drugs is not working,” said Polanski.
“In fact it’s making drugs more dangerous and actually what we need is a grown-up conversation based in evidence, taking a public health approach that looks at prevention, intervention and make sure that afterwards people can get the support they need.”
Last year, The Thistle in Glasgow became the first place in the UK where people could inject heroin or cocaine while under medical supervision without being prosecuted.
The UK government has said it would not change the existing drug laws to allow for the creation of more legal drug consumption rooms but would welcome any evidence that came out of The Thistle’s three year pilot.
They added that the government was “focused on delivering a balanced approach with strengthened law enforcement to tackle supply coupled with investment in treatment, the development of a skilled workforce, sustainable recovery services and peer networks that will support people in recovery with employment, housing and education”.