The US added 64,389 full-time legal cannabis jobs in 2018. That outpaces growth in other sectors in the job market. Job openings in the cannabis industry have also surged. Forget the energy industry . Marijuana appears to be the fastest growing job sector in the US. The US added 64,389 full-time legal cannabis jobs in 2018, according to a new report from Leafly and Whitney Economics. That brought the total number of positions for the year to 211,000, a 44% rise from a year earlier.