A young woman told of how she was driven to take Spice while living on the streets without enough money to buy food after she was credited with Universal Credit.
Sophie, 23, said she had reached the lowest point and returned to take the drug even though she had previously fought hard to get into the habit.
He argued that it should not take long to receive payments and urged the system to change.
Sophie, who has autism and ADHD, has been on the road for two months last October without food or money and blames "delays" in the new universal credit system.
He claims that his money has halved when the system has changed.
Sophie, whose surname was not reported due to her vulnerable circumstances, bravely spoke to Devon Live about how she briefly resumed taking Spice.
Now works as a volunteer to help other vulnerable people in the Torquay PATH homelessness charity.
Sophie said, "My worst point sleeping on the street was returning to the only drug I did not want to go in. Spice.
" I came back to Spice when I was on the road. I hit my lowest point.
"Now I can not even be close to the people who have had it, even when I smell it, I fight to try not to want it.
" It took me a year and a half to deciding to get out of it and return to last year's February I won that fight. "
But then, he says, all she went wrong again and she came back on drugs while on the street.
Sophie added: "I had my mental health against me, I put my disabilities against me. The smallest thing you do wrong becomes a huge thing used against you.
"I want the system to change, I want it to stop being how bad it is.
" It should not take so long to get money. You should not wait that long.
"Coming to the PATH keeps me out of trouble – I can get a lot of trouble if I want to."
Now Sophie is helping daily in the PATH charity center in Torquay.
PATH President Kath Friedrich said: "Sophie is an absolute Trojan horse – she works so hard for others here."
Sophie explained: "I went from £ 230 every two weeks on ESA (Employment and Support Allowance) to £ 230 every month on Universal Credit, because fortunately I get an extra £ 90 PIP, the lowest rate because I have autism and ADHD.
"Before I discovered this place I went two months without food.
"It was to move from the ESA to universal credits – it took two months to set everything up.
" I had to get a loan because I could not go another month without food. Now I have to return it within a year. I had no money for two months except PIP.
"I discovered this place (PATH) in October and I stopped taking Spice.I've been on the road for two months before.
" Now I'm in a shared accommodation. It is only temporary. Everything is temporary in these days.
PATH that provides food and support for the homeless and runs one of Devon's largest food banks.
The charity that offers shelter to the most vulnerable in Torbay was made homeless last fall – but the Torbay Council entered a temporary settlement last November.
Now the Torbay Council has given PATH an eviction notice and must leave the first week of February.
£ 25,000 fundraising facility was set up to pay rent for a permanent In the space of two days, the crowdfunding appeal had reached £ 875.
A Department of Labor and Pensions spokesperson said : "Universal credit is a positive force, and works for the vast majority of people.
" Budget support is in place for anyone who needs additional help, and advance payments are available from the first day of a universal credit . "