By Harry Davies Mike Tyson has stayed true to his promise by giving up smoking cannabis before his fight against Jake Paul. Heavyweight legend Tyson is preparing for a one-off return to the ring against YouTuber-turned-boxer Paul on July 20. The 57-year-old hasn’t fought since going eight rounds against fellow icon Roy Jones Jr. in November 2020. Tyson is seemingly taking his fight against Paul very seriously having abstained from sex and cannabis since the bout was announced last month. “I’m living my life disciplined now, so I’m fight disciplined now. In probably six weeks, I haven’t gotten …