Delegates at the party’s national conference in Glasgow have urged the UK government to devolve powers to Holyrood to do this.
They made the call after hearing from multiple sclerosis sufferer Laura Brennan-Whitefield, who called on the party to show “compassion and common sense”.
She said: “I’m not advocating the smoking of cannabis, what I’m advocating is a progressive and reasonable, compassionate society where you can access pain relief.”
Brennan-Whitefield said: “I have been living with multiple sclerosis for nine years and the fact that I’m standing here giving this speech means I am one of the lucky ones.
“It has become very clear to me over these last nine years that many people living with MS have been using cannabis to help with the symptoms of that condition, in fact it’s one of the worst-kept secrets at the hospital.
“All of these people risk a criminal record, unlike in Australia, Chile, Canada, Finland, France, Germany, Romania and some US states.”
Currently cannabis is a Class B drug, with people facing up to five years in jail for possessing it, or up to 14 years in prison for being involved in its supply or production.
“I don’t think someone who is in pain should be criminalised for trying to ease that pain,” Brennan-Whitefield said.
“I am talking about the medical use only of cannabis, and it’s that medical use that is wider than just MS – arthritis, cancer, Crohn’s disease, epilepsy, palliative care, have all been shown to benefit from cannabis medication.”
Brennan-Whitefield continued: “I know what it is to suffer pain, and be in no doubt, if it came to it I would not hesitate to ease that pain any way I could. That is a natural instinct.”
While the resolution was backed by the majority of delegates at the conference hall, it was opposed by Councillor Audrey Doig, who told how her cousin had started using cannabis to relieve pain before moving on to harder drugs.
She said: “Nowadays people are looking for quick fixes as far as pain is concerned, and they look for quick fixes when the pain medication doesn’t work and they go on to stronger painkillers.”