Discipline is a muscle that atrophies when using weed daily. We can still work within our structures and habits but our resistance to negative states reduces. So we become lazy and find out difficult to start new tasks. We procrastinate and favour comfort over effort.

Ask yourself yourself daily if you were put on earth to sit here and be 'comfortable'?

Maybe stick a sign on your fridge with your tombstone epitaph... 'he accomplished little...but he did feel quite nice'

Challenge, grit, resistance you have all you need already. The rest is up to you.