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Despite the availability of this information, the authors note that most of the general public and even medical professionals appear unaware of the dangers of light smoking
Decreased hemoglobin levels are associated with decreased maximal oxygen uptake and submaximal exercise capacity.6 Athletes have attempted to increase hemoglobin levels through blood doping, use of exogenous hormones and altitude training (real or simulated).7 These techniques are mostly illegal, and even altitude training has substantial health risks with physiologic benefits that are relatively modest and transient
For example, Stapleton et al67 showed that contingent prescriptions could yield additional life years at a cost between 398 (US$724) and 758 (US$1,380) in 1998 UK pounds compared to brief counseling alone
It might look OK, but the contacts may be dirty and cause resistance
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