Cannabis is illegal where I live. Is Merlin400 illegal too ?

Short answer : No.
The Merlin400 is fully legal everywhere.
The longer answer is, that the cannabinoid THC is still illegal in many countries – this means that access to herbs containing more than 0,2% THC are limited in many areas.
Industrial hemp and and CBD-skunk, used for producing CBD-oils, are legal and available in most countries, as long as the herbs contain less than 0,2% THC.
Cannabis oils extracted from these herbs can contain THC over this limit – which makes it illegal to sell in countries still upholding prohibition on THC. So :
Herbs with less than 0,2% THC is legal in Europe, USA and many other areas.
Merlin400 is perfectly legal everywhere.
Here is an external link to more knowledge about the legality of CBD and THC