there are many different kinds of weedkillers, in the bottom line most of them damage the plants ability to protect it self from free radicals or the sun which will then kill it but this is by no means a comprehencive answer.
I do. I actually don't like to take pain killers without smoking weed.
no.
Yes
roundup
* Reduce the use of Weed killers ,if it is too compulsary use only weed killers which do not harm the land
The time it takes for weed killer to work can vary depending on the product and the type of weeds being targeted. In general, most weed killers start to show visible effects within a few days to a couple of weeks.
Dioxin
all weed killers are is salt and water making it safe to drink.
Herbicide
In the US, "weed killers" is a colloquialism for a class of pesticides called herbicides. Glyphosate (Roundup is one brand) and glufosinate (Liberty is one brand) are a couple of common examples.
Weed or marijuana has a more Depressant rather than pain killers witch have artificial drugs manufactured and Marijuana has actually a less likely chance to get addicted on them.
Organic foods are produced without manufactured fertilizers. pesticides or weed killers only if they are considered natural.