If you already know how to set the wanted level (i dont know how haha) but if you know the function, lets say its just wantedlevel for now

You would probably normally do wantedlevel = 5 for example, that would then set the wanted level to 5 stars.

Instead try to do wantedlevel += 1 . That should add 1 to the existing wanted level. Then to remove one star do:
wantedlevel -= 1 that would then remove one from the current wanted level

the += and -= operators will append and deduct respectivly. Instead of simply setting the value to whatever you say after the operator.
Hope this helps. Im not 100% sure you actually can append and deduct on the wanted level but hopefully you can

There is already an animation in deafult gta for smoking while standing. You cant move around at the same time tho, but that migth be overcomable with some programing. Anyways, if you download a menu that allowes you to play animations you can look for the smoke emote there

@Magu i know its been 2 years but im tryna add money to a player the same way as you and was wondering if you figured out a way to add it to the character the player is currently using and not only michael

So i want to add money to the player using the RPH API once the player completes a mission
Ive so far got this code:

                        NativePointer nativePointer = new NativePointer();
                         NativeFunction.Natives.STAT_GET_INT(0x324C31D, nativePointer, -1);            
                        nativePointer.SetValue(nativePointer.GetValue<int>() + 2000);
                        NativeFunction.Natives.STAT_SET_INT<int>(0x324C31D, nativePointer.GetValue<int>(), -1);

The only problem with this code is that it only adds money to michael. Anyone know how to find the character the player is using and then change the hash(currently:0x324C31D) based on what character the player is using so the monney gets applied to the correct character?