Originally Posted by Only Ornamental
Not exactly... For induction of haploid plants one does things like growing anthers in a Petri dish and treat them with heat, cold, or other stresses and not only chemicals (if ever). There are huge differences regarding the needed stimuli not only between species but also between varieties and cultivars. In the next step, the doubling of the chromosomes, colchicine and other spindle toxins such as oryzalin are often a must. It's not about doubling single genes or inducing mutations, but simply the chromosome doubling naturally happening after pollen and egg (both are haploid BTW) fuse.
Whilst colchicine will work you can use the likes of nitrous oxide, acenaphthene, 8-Hydroxyquinoline, p-fluorophenylalanine, Chloramphenicol (ie eye drops) to name a few sources...
Even if one is to look at just mutation breeding though I'm not sure there's any benefit to cannabis doing so, you could vastly speed up the process with DH's as you can fix the mutation in the 1st gen after the treatment.. (the mutant bit is more aimed at Rox/Mate dave