The idea that the pesticides can harm the end user is alot different than on sugar cane or corn, These are processed and cleaned somewhat, but the bud you are looking at growing will get picked, dried out, and packed into a bowl or rolled into a spliff and taken directly into your lungs... you will be taking the pesticides into your lungs along with the smoke if the buds get dusted.
On top of that, what if the cane gets harvested before the plants are ready... you will loose all you worked for to the machines that do the harvesting...
Not sure where you are at, but you should figure out when your light will go 12/12 and figure that budding should happen after that, and harvesting will happen a month or so after.... will it get dusted after that time, will it get harvested before that time... ?