Cotinine is detectable in blood for at least several days after exposure to tobacco smoke. Depending on how much you smoke, the level of cotinine in your blood will reflect a nonsmoker level in 7 to 10 days. The nicotine test that offers the longest detection window is a hair follicle nicotine test. These are rarely administered due to their expense, but they do exist.
High pH is NOT always BAD! But, high pH is NOT always GOOD, either! The recommendation that swimming pools should be operated at pH levels between 7.2 and 7.6 is almost universal. This recommendation is enshrined in generations of pool books and literature. It's embedded in many state swimming pool codes. Unfortunately, for most swimming pools, it's also far from ideal.
The answer depends on your age and the type of water exercise you're doing. Small children and older people typically prefer pool temperatures to be a little warmer. Swimmers training for competitions may need cooler water, so they won't overheat. In general, pool temperatures between 83 F (28.3 C) and 88 F (31.1 C) are usually comfortable for most types of water exercise. Pools that are used for physical therapy typically have warmer water to help relax muscles and make stretching exercises easier. Water exercise is a good choice for people who have arthritis because the buoyancy of the water helps protect joints from weight-bearing impacts.