Some cannabis users prefer to stick to only one marijuana strain since they know how it will affect them. Others like to try as many as they possible can. But there are some strains out there that people will simply never return to.

Here are seven marijuana strains you’ll probably only want to try once:

1. Alaskan Thunder F***

There’s nothing wrong with Alaskan Thunder F***. It’s a perfectly good strain. But at the same time it’s definitely going to bring up some conversations if that’s the strain you’re always busting out in front of company.

2. Chemdawg

Chemdawg is pretty potent strain of marijuana, which means it’s not necessarily for newbies. But the reason you may not try it again is its aroma. It has a very strong and distinct diesel smell. For some people that may be appealing, for others it may be revolting.

3. Champagne Kush

You may purchase some Champagne Kush expecting to have some high quality marijuana. But really Champagne Kush isn’t any better or more luxurious than other strains out there, so you may be disappointed if you don’t feel like a billionaire while smoking it.

4. Acapulco Gold

During the 1960’s and 1970’s, Acapulco Gold was considered the best marijuana strain in the world. And thanks to its legendary status, people still seek it out. But you may realize it’s not nearly as great as people make it seem and there’s plenty of strains that are as good or better.

5. Sour Diesel

Sour Diesel is very similar to Chemdawg in that it’s a very powerful strain with a very pungent, diesel-like smell. However, it’s also a long lasting strain with strong medical benefits, so it may be a good choice if you need a strain for some quick recovery.

6. Bruce Banner

You may be drawn to this strain for its Marvel Comics ties, but this strain is definitely more Incredible Hulk than Bruce Banner. It’s one of the most powerful strains available, and even experienced cannabis users may find it’s a little too much for them to handle.

7. Fruity Pebbles OG

The reason Fruity Pebbles is on this list has nothing to do with its taste, which is fruity and sweet, or its effects, which are pretty powerful. You’ll probably only use Fruity Pebbles once because it’s nearly impossible to find. It’s one of the most rare strains out there, and the amount of time and energy you put into finding it may be only worthy a one-time adventure.