15 million followers, many of them children. Tonight the backlash. Californias new gold rush, inside the Worlds Largest market for legal recreational pot. Announcer this is nbc nightly news with lester holt. Good evening to our viewers in the west and happy new year. Great to be back with you. Millions of americans made the post holiday track back to work and schools today in the teeth of an arctic blast that has left at least 15 people dead. Triggered wind chill and deep freeze warnings from the deep south, state of emergency in georgia to new england. There has been perilous travel, left firefighters battling fire and ice, turned Niagara Falls into a chilling still life. For some, the worst is still to come. Blake mccoy with the latest. Oh, my god. Someone just ran off the road. Reporter tonight 19 degrees and snowing in buffalo. A massive pileup is snarling interstate 90, a foreboding look at whats to come with a major snowstorm set to move up the east coast. Wow. Look at that truck