Smolov is very intense. I made it through the base mesocycle and the switching phase, and just completed my first week of the intense mesocycle. If you can squat 2x your bodyweight, I would give it a try. On one of the websites mentioned above, it says to incorporate a protyazhka (a variation of the snatch) to warm up, no matter what cycle you are in. You can do other muscles like upper body on the days when you don’t squat, but I would recommend against working anything lower body, because a) you will be fatigued and b) this will take away from your next squat session.
However, I did have the urge to DL, so after I finished the base mesocycle, before entering the switching phase, I DL’ed and I got an 18 pound PR, without DL’ing at all during Smolov.
The chart that Martin Blank said to use is different from the chart that is found on the Strong Lifts site that The Dude Abides said to use. The former has days and percentages that are different from the Smolov program. For example, it says to squat M, W, F on the intense mesocycle while the Smolov program says to squat M, W, Sat in that cycle.
And just so you know–in the base mesocycle, Saturdays are hell, and in the intense mesocycle, Wednesdays are horrible.
So, overall, it will increase your squat like crazy and you will be able to pop out of the hole quicker but it will be hard to integrate Olympic lifts into the base and intense mesocycles.