There has to be a drawback?
If it is your first time consuming cannabis-product, eating a Canna Cookie from Bobbygreenhash will have you experience something that you will describe as the worst experience in your life. You will be convinced that it cannot possibly be only cannabis; you will think you are poisoned and will naturally react as if you are: nausea, vomiting, anxiety, thoughts of dying or being already dead. If what I read here about a Burfee from Hash Mama is accurate, you will probably want to start a religion after eating one of those.
This is down to mainly 2 things:
- the volume of THC and CBD is very high and,
- eating cannabis has the THC processed by your liver into 11 hydroxy metabolite, which is 3-5x more psychoactive than THC. Think of it as smoking/vaping 3x as much.
The truth is that it is merely your consciousness trying to understand what is happening to your body and trying to fight it. You will have zero permanent damage, other than what you inflict on yourself physically and emotionally. You might feel a little under the effect for 24-hours or so afterwards but recover completely thereafter, with one helluva story to tell.
Even if you eat a whole box of Canna Cookies or Burfee, you will be alright. It is practically impossible to overdose on cannabis - you will most likely die due to complications associated with of the process of trying to overdose (ruptured stomach, asphyxiation, etc) long before you have enough cannabis in your system to OD.
If I have to offer up a drawback it would be that you can easily find yourself consuming cannabis on a daily basis because of the overwhelmingly positive effect is has. That may be seen as having a dependency on it. Fortunately there are many many variants available withing the 2 main strains with different effects, benefits and drawbacks, so you have to try and find which ones works the best for your mind, and body. There are no withdrawal effects from quitting cold-turkey, other than longing for the effects when you eat something delicious, watch certain movies/shows, having sex, etc. It is a stimulant, unlike alcohol, which is a depressant.
Use the attached image to get an idea of what strain offers what.