It really depends on the herb but as a general rule you likely cannot. If you are cooking and decide to add double or triple or even 10x the herbs / spices then the recipe suggests you will be fine. The worse case scenario is that you make it taste bad. That being said everything is poison at high enough doses but for culinary herbs that is a huge dose. You will really have to force yourself to eat large enough quantities since it will taste very unpleasant.
There are plenty of other plants that are more dangerous.
It really depends on the herb but as a general rule you likely cannot. If you are cooking and decide to add double or triple or even 10x the herbs / spices then the recipe suggests you will be fine. The worse case scenario is that you make it taste bad. That being said everything is poison at high enough doses but for culinary herbs that is a huge dose. You will really have to force yourself to eat large enough quantities since it will taste very unpleasant.
There are plenty of other plants that are more dangerous.