With some causes of dementia, curing the underlying condition isn't possible, and so dementia treatment focuses on easing the symptoms. This can help reduce distress and disruption for the caregiver as well as the patient. Different types of drug treatments, of course, apply to different categories of symptoms:
To climb stairs, place your cane in the hand opposite your injured leg. With your free hand, grasp the handrail. Step up on your good leg first, then step up on the injured leg. To come down stairs, put your cane on the step first, then your injured leg and then, finally, your good leg, which carries your body weight.
I think leg shaking could go hand and hand with a few things. Such as OCD, Anxiety, ADD, Restless Leg syndrome, and numerous neurological diseases. What I really found interesting about what you brought up was the nicotine. That would make a lot of sense from a self medicating stand point.