Need advices

Dear leavers, I'm 34 and have been fooling around with weed since I was 15. I failed at everything and made weed my priority over anything for as long as I've been smoking. Now I'm lucky to undergo a 8 months training as a landscape gardener. The problem is I'm still Very addicted to weed. The choice I have to make is A keep smoking have restful sleep at night etc but being below my normal cognitive and social skills and In a way waste that exceptional chance I have to learn a proper job.. B Quitting weed to be the best version of myself but suffer a month of insomnia almost falling asleep in class having trouble eating etc.. What would be the best strategy? Please help me on that one. Have a good day.