ready to flush first grow with bugs

ready to start my pure water flush in a couple days and from what i read it looks like i have a white fly problem...i plan on flushing for a week but i dont know what to do about the bugs...i'v been using Natural Guard insecticidal soap for the bugs on my veggin plants,the label says you can use up to day of harvest but i dont know if that applies to something you plan on smoking?

what to do? spray them and give an extra week flush? spray and harvest as planned or should i not spray at all?

you can just get some rubbing alcohol and spray it on the plants it will kill the bugs and it evaporates quickly also just after you spray put a fan or some other kind of blower in the room or on the plants for about an hour or till the alcohol evaporates.